Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Billings, MT
Issued by NWS Billings, MT
396 FNUS55 KBYZ 181858 FWFBYZ Fire Weather Planning Forecast for SCen and SErn Montana National Weather Service Billings MT 1258 PM MDT Tue Aug 18 2026 .DISCUSSION... Scattered showers and thunderstorms are expected for this afternoon and evening with a few severe thunderstorms possible. Strong wind gusts (60+ mph), hail, and heavy rain will be the main concerns. Conditions warm and dry Wednesday through Friday as ridging builds in. Temperatures in the 80s and low 90s are expected with min RHs in the teens to low 20s percent. TS MTZ123-191015- Gallatin National Forest- 1258 PM MDT Tue Aug 18 2026 .Tonight... * Sky/weather...........Mostly cloudy with isolated rain showers in the evening, then mostly clear overnight. * Min temperature.......47-57 at 5000 feet...42-52 at 7000 feet. * 24 hr trend.........3 degrees cooler. * Max humidity..........66-76 percent at 5000 feet...68-78 percent at 7000 feet. * 24 hr trend.........12 percent drier. * Wind (20 ft) * Slope/valley.........South winds 5 to 10 mph. * Ridgetop.............Northwest 10 to 20 mph. * Chance of lightning...8 percent. * CWR...................Less than 10 percent. .WEDNESDAY... * Sky/weather...........Sunny. * Max temperature.......78-88 at 5000 feet...66-76 at 7000 feet. * 24 hr trend.........4 degrees warmer. * Min humidity..........14-24 percent at 5000 feet...17-27 percent at 7000 feet. * 24 hr trend.........10 percent drier. * Wind (20 ft) * Slope/valley.........Southwest winds 5 to 10 mph in the morning shifting to the northwest in the afternoon. * Ridgetop.............West 10 to 20 mph. * Chance of lightning...0 percent. * CWR...................Zero. .WEDNESDAY NIGHT... * Sky/weather...........Partly cloudy. * Min temperature.......49-59 at 5000 feet...44-54 at 7000 feet. * 24 hr trend.........3 degrees warmer. * Max humidity..........39-44 percent. * 24 hr trend.........18 percent drier. * Wind (20 ft) * Slope/valley.........South winds 5 to 10 mph. * Ridgetop.............West 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .THURSDAY... * Sky/weather...........Sunny. * Max temperature.......84-93 at 5000 feet...72-82 at 7000 feet. * 24 hr trend.........5 degrees warmer. * Min humidity..........18-23 percent. * 24 hr trend.........2 percent wetter. * Wind (20 ft) * Slope/valley.........South winds 5 to 10 mph in the morning shifting to the west in the afternoon. * Ridgetop.............West 5 to 15 mph. * Chance of lightning...1 percent. * CWR...................Zero. .Forecast days 3 through 7...... .THURSDAY NIGHT...Partly cloudy. Lows 53 to 63. South winds 5 to 10 mph. .FRIDAY...Mostly cloudy. Isolated showers and thunderstorms. Lows 54 to 64. Highs 83 to 93. South winds 5 to 10 mph. .SATURDAY...Mostly cloudy. Scattered showers and thunderstorms. Lows 52 to 62. Highs 79 to 88. South winds 5 to 10 mph. .SUNDAY...Partly cloudy. Isolated showers and thunderstorms. Lows 50 to 60. Highs 78 to 86. Southwest winds 5 to 10 mph. .MONDAY...Partly cloudy. Isolated showers and thunderstorms. Lows 50 to 60. Highs 78 to 87. .TUESDAY...Partly sunny. Scattered showers and thunderstorms. Highs 78 to 87. $$ MTZ124-191015- Wheatland County/Sweet Grass County- 1258 PM MDT Tue Aug 18 2026 .Tonight... * Sky/weather...........Mostly cloudy with isolated showers and thunderstorms in the evening, then mostly clear overnight. * Min temperature.......50-55. * 24 hr trend.........2 degrees cooler. * Max humidity..........66-71 percent. * 24 hr trend.........15 percent drier. * Wind (20 ft) * Plains...............West winds 5 to 15 mph. * Chance of lightning...17 percent. * CWR...................Less than 10 percent. .WEDNESDAY... * Sky/weather...........Sunny. * Max temperature.......82-87. * 24 hr trend.........3 degrees warmer. * Min humidity..........15-20 percent. * 24 hr trend.........7 percent drier. * Wind (20 ft) * Plains...............West winds 10 to 20 mph. * Chance of lightning...1 percent. * CWR...................Zero. .WEDNESDAY NIGHT... * Sky/weather...........Partly cloudy. Patchy smoke through the night. * Min temperature.......50-55. * 24 hr trend.........Unchanged. * Max humidity..........54-59 percent. * 24 hr trend.........12 percent drier. * Wind (20 ft) * Plains...............West winds 5 to 15 mph. * Chance of lightning...0 percent. * CWR...................Zero. .THURSDAY... * Sky/weather...........Sunny. * Max temperature.......89-94. * 24 hr trend.........7 degrees warmer. * Min humidity..........12-17 percent. * 24 hr trend.........3 percent drier. * Wind (20 ft) * Plains...............West winds 5 to 15 mph. * Chance of lightning...0 percent. * CWR...................Zero. .Forecast days 3 through 7...... .THURSDAY NIGHT...Partly cloudy. Lows 54 to 59. Northwest winds 5 to 15 mph. .FRIDAY...Partly cloudy. Lows 56 to 61. Highs 84 to 89. East winds 5 to 15 mph. .SATURDAY...Mostly cloudy. Scattered showers and isolated thunderstorms. Lows 54 to 59. Highs 84 to 89. Southwest winds 5 to 15 mph. .SUNDAY...Partly cloudy. Lows 51 to 56. Highs 83 to 88. Northwest winds 10 to 20 mph with gusts to around 30 mph. .MONDAY...Partly cloudy. Lows 52 to 57. Highs 82 to 87. .TUESDAY...Mostly sunny. Highs 83 to 88. $$ MTZ125-191015- Stillwater County- 1258 PM MDT Tue Aug 18 2026 .Tonight... * Sky/weather...........Mostly cloudy with isolated showers and thunderstorms in the evening, then mostly clear overnight. * Min temperature.......53-58. * 24 hr trend.........3 degrees cooler. * Max humidity..........57-62 percent. * 24 hr trend.........10 percent drier. * Wind (20 ft) * Plains...............Southwest winds 5 to 10 mph. * Chance of lightning...17 percent. * CWR...................Less than 10 percent. .WEDNESDAY... * Sky/weather...........Sunny. * Max temperature.......86-91. * 24 hr trend.........7 degrees warmer. * Min humidity..........12-17 percent. * 24 hr trend.........13 percent drier. * Wind (20 ft) * Plains...............Northwest winds 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .WEDNESDAY NIGHT... * Sky/weather...........Partly cloudy. Patchy smoke overnight. * Min temperature.......55-60. * 24 hr trend.........2 degrees warmer. * Max humidity..........43-48 percent. * 24 hr trend.........14 percent drier. * Wind (20 ft) * Plains...............West winds 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .THURSDAY... * Sky/weather...........Sunny. * Max temperature.......91-96. * 24 hr trend.........5 degrees warmer. * Min humidity..........14-19 percent. * 24 hr trend.........2 percent wetter. * Wind (20 ft) * Plains...............Light winds in the morning becoming east 5 to 10 mph in the afternoon. * Chance of lightning...1 percent. * CWR...................Zero. .Forecast days 3 through 7...... .THURSDAY NIGHT...Partly cloudy. Lows 58 to 63. Southwest winds 5 to 10 mph. .FRIDAY...Partly cloudy. Lows 60 to 65. Highs 87 to 92. Northwest winds 5 to 10 mph. .SATURDAY...Mostly cloudy. Scattered showers and thunderstorms. Lows 59 to 64. Highs 86 to 91. Southwest winds 5 to 10 mph. .SUNDAY...Partly cloudy. Scattered showers and thunderstorms. Lows 56 to 61. Highs 85 to 90. West winds 5 to 10 mph. .MONDAY...Partly cloudy. Isolated showers and thunderstorms. Lows 56 to 61. Highs 83 to 88. .TUESDAY...Partly sunny. Scattered showers and isolated thunderstorms. Highs 84 to 89. $$ MTZ126-191015- Beartooth Ranger District Custer National Forest- 1258 PM MDT Tue Aug 18 2026 .Tonight... * Sky/weather...........Mostly cloudy with scattered rain showers and isolated thunderstorms in the evening, then mostly clear overnight. * Min temperature.......54-59 at 5000 feet...45-55 at 7000 feet. * 24 hr trend.........2 degrees cooler. * Max humidity..........57-62 percent. * 24 hr trend.........10 percent drier. * Wind (20 ft) * Slope/valley.........West winds 5 to 15 mph. * Ridgetop.............Northwest 10 to 20 mph. * Chance of lightning...22 percent. * CWR...................Less than 10 percent. .WEDNESDAY... * Sky/weather...........Sunny. * Max temperature.......77-87 at 5000 feet...69-79 at 7000 feet. * 24 hr trend.........4 degrees warmer. * Min humidity..........15-25 percent at 5000 feet...18-28 percent at 7000 feet. * 24 hr trend.........12 percent drier. * Wind (20 ft) * Slope/valley.........Northwest winds 5 to 15 mph. * Ridgetop.............West 5 to 15 mph. * Chance of lightning...0 percent. * CWR...................Zero. .WEDNESDAY NIGHT... * Sky/weather...........Partly cloudy. * Min temperature.......55-63 at 5000 feet...49-59 at 7000 feet. * 24 hr trend.........4 degrees warmer. * Max humidity..........39-44 percent. * 24 hr trend.........18 percent drier. * Wind (20 ft) * Slope/valley.........Southwest winds 5 to 15 mph. * Ridgetop.............Northwest 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .THURSDAY... * Sky/weather...........Sunny. * Max temperature.......82-92 at 5000 feet...73-83 at 7000 feet. * 24 hr trend.........4 degrees warmer. * Min humidity..........16-26 percent at 5000 feet...19-29 percent at 7000 feet. * 24 hr trend.........1 percent wetter. * Wind (20 ft) * Slope/valley.........Southwest winds 5 to 10 mph in the morning shifting to the northeast in the afternoon. * Ridgetop.............West 5 to 10 mph. * Chance of lightning...8 percent. * CWR...................Zero. .Forecast days 3 through 7...... .THURSDAY NIGHT...Partly cloudy. Lows 59 to 68. West winds 5 to 10 mph. .FRIDAY...Mostly cloudy. Isolated showers and thunderstorms. Lows 60 to 69. Highs 82 to 91. West winds 5 to 10 mph. .SATURDAY...Mostly cloudy. Scattered showers and thunderstorms. Lows 59 to 67. Highs 81 to 90. Southwest winds 5 to 15 mph. .SUNDAY...Mostly cloudy. Scattered showers and thunderstorms. Lows 56 to 64. Highs 79 to 87. West winds 5 to 15 mph. .MONDAY...Mostly cloudy. Scattered showers and thunderstorms. Lows 56 to 65. Highs 77 to 86. .TUESDAY...Partly sunny. Scattered showers and thunderstorms. Highs 79 to 87. $$ MTZ127-191015- Golden Valley County/Musselshell county- 1258 PM MDT Tue Aug 18 2026 .Tonight... * Sky/weather...........Mostly cloudy. Scattered rain showers in the evening. * Min temperature.......56-61. * 24 hr trend.........3 degrees cooler. * Max humidity..........60-65 percent. * 24 hr trend.........5 percent drier. * Wind (20 ft) * Plains...............Southwest winds 5 to 15 mph. * Chance of lightning...14 percent. * CWR...................10 percent. .WEDNESDAY... * Sky/weather...........Sunny. * Max temperature.......80-85. * 24 hr trend.........3 degrees warmer. * Min humidity..........21-26 percent. * 24 hr trend.........9 percent drier. * Wind (20 ft) * Plains...............West winds 5 to 15 mph. * Chance of lightning...1 percent. * CWR...................Zero. .WEDNESDAY NIGHT... * Sky/weather...........Partly cloudy. Patchy smoke in the evening. * Min temperature.......58-63. * 24 hr trend.........2 degrees warmer. * Max humidity..........45-50 percent. * 24 hr trend.........15 percent drier. * Wind (20 ft) * Plains...............North winds 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .THURSDAY... * Sky/weather...........Sunny. * Max temperature.......85-90. * 24 hr trend.........5 degrees warmer. * Min humidity..........16-21 percent. * 24 hr trend.........5 percent drier. * Wind (20 ft) * Plains...............Southwest winds 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .Forecast days 3 through 7...... .THURSDAY NIGHT...Partly cloudy. Lows 60 to 65. Northeast winds 5 to 15 mph. .FRIDAY...Partly cloudy. Lows 63 to 68. Highs 82 to 87. Northeast winds 5 to 15 mph. .SATURDAY...Mostly cloudy. Scattered showers. Lows 62 to 67. Highs 82 to 87. South winds 5 to 15 mph. .SUNDAY...Partly cloudy. Isolated showers. Lows 59 to 64. Highs 81 to 86. Northwest winds 5 to 15 mph. .MONDAY...Partly cloudy. Lows 60 to 65. Highs 79 to 84. .TUESDAY...Mostly sunny. Highs 81 to 86. $$ MTZ128-191015- Yellowstone County- 1258 PM MDT Tue Aug 18 2026 .Tonight... * Sky/weather...........Mostly cloudy. Scattered rain showers and isolated thunderstorms in the evening. * Min temperature.......57-62. * 24 hr trend.........3 degrees cooler. * Max humidity..........67-72 percent. * 24 hr trend.........3 percent drier. * Wind (20 ft) * Plains...............Southwest winds 5 to 15 mph. * Chance of lightning...16 percent. * CWR...................Less than 10 percent. .WEDNESDAY... * Sky/weather...........Sunny. * Max temperature.......86-91. * 24 hr trend.........4 degrees warmer. * Min humidity..........14-19 percent. * 24 hr trend.........9 percent drier. * Wind (20 ft) * Plains...............West winds 5 to 15 mph. * Chance of lightning...0 percent. * CWR...................Zero. .WEDNESDAY NIGHT... * Sky/weather...........Partly cloudy. Patchy smoke through the night. * Min temperature.......57-62. * 24 hr trend.........Unchanged. * Max humidity..........56-61 percent. * 24 hr trend.........11 percent drier. * Wind (20 ft) * Plains...............Northwest winds 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .THURSDAY... * Sky/weather...........Sunny. * Max temperature.......91-96. * 24 hr trend.........5 degrees warmer. * Min humidity..........16-21 percent. * 24 hr trend.........2 percent wetter. * Wind (20 ft) * Plains...............West winds 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .Forecast days 3 through 7...... .THURSDAY NIGHT...Partly cloudy. Lows 61 to 66. Northeast winds 5 to 10 mph. .FRIDAY...Partly cloudy. Lows 63 to 68. Highs 89 to 94. Northeast winds 5 to 15 mph. .SATURDAY...Mostly cloudy. Scattered showers. Lows 62 to 67. Highs 88 to 93. West winds 5 to 10 mph. .SUNDAY...Partly cloudy. Isolated showers. Lows 60 to 65. Highs 87 to 92. Northwest winds 5 to 15 mph. .MONDAY...Partly cloudy. Isolated showers. Lows 60 to 65. Highs 85 to 90. .TUESDAY...Mostly sunny. Highs 87 to 92. $$ MTZ129-191015- Crow Indian Reservation/Bighorn Canyon Rec Area- 1258 PM MDT Tue Aug 18 2026 .Tonight... * Sky/weather...........Partly cloudy. Isolated showers and thunderstorms in the evening. * Min temperature.......55-60 at 5000 feet...52-57 at 7000 feet. * 24 hr trend.........3 degrees cooler. * Max humidity..........57-67 percent at 5000 feet...55-63 percent at 7000 feet. * 24 hr trend.........Unchanged. * Wind (20 ft) * Slope/valley.........Southwest winds 5 to 10 mph. * Ridgetop.............Northwest 10 to 20 mph. * Chance of lightning...22 percent. * CWR...................Less than 10 percent. .WEDNESDAY... * Sky/weather...........Sunny. * Max temperature.......77-87 at 5000 feet...68-77 at 7000 feet. * 24 hr trend.........5 degrees warmer. * Min humidity..........16-23 percent at 5000 feet...20-25 percent at 7000 feet. * 24 hr trend.........9 percent drier. * Wind (20 ft) * Slope/valley.........West winds 5 to 15 mph. * Ridgetop.............West 15 to 25 mph. * Chance of lightning...1 percent. * CWR...................Zero. .WEDNESDAY NIGHT... * Sky/weather...........Partly cloudy. Patchy smoke through the night. * Min temperature.......57-63 at 5000 feet...56-61 at 7000 feet. * 24 hr trend.........3 degrees warmer. * Max humidity..........37-47 percent at 5000 feet...33-38 percent at 7000 feet. * 24 hr trend.........21 percent drier. * Wind (20 ft) * Slope/valley.........Northeast winds 5 to 10 mph in the evening shifting to the south overnight. * Ridgetop.............West 10 to 20 mph. * Chance of lightning...0 percent. * CWR...................Zero. .THURSDAY... * Sky/weather...........Sunny. * Max temperature.......83-93 at 5000 feet...74-82 at 7000 feet. * 24 hr trend.........4 degrees warmer. * Min humidity..........14-23 percent at 5000 feet...19-25 percent at 7000 feet. * 24 hr trend.........2 percent drier. * Wind (20 ft) * Slope/valley.........Southwest winds 5 to 10 mph in the morning shifting to the northwest in the afternoon. * Ridgetop.............West 10 to 20 mph. * Chance of lightning...0 percent. * CWR...................Zero. .Forecast days 3 through 7...... .THURSDAY NIGHT...Mostly clear. Lows 61 to 67. East winds 5 to 10 mph. .FRIDAY...Partly cloudy. Lows 62 to 69. Highs 81 to 91. East winds 5 to 10 mph. .SATURDAY...Mostly cloudy. Isolated showers and thunderstorms. Lows 61 to 67. Highs 80 to 90. Southeast winds 5 to 10 mph. .SUNDAY...Partly cloudy. Isolated showers and thunderstorms. Lows 59 to 64. Highs 78 to 88. Northwest winds 5 to 10 mph. .MONDAY...Partly cloudy. Lows 59 to 64. Highs 76 to 86. .TUESDAY...Mostly sunny. Highs 78 to 88. $$ MTZ130-191015- Northern Rosebud/Northern Treasure Counties- 1258 PM MDT Tue Aug 18 2026 .Tonight... * Sky/weather...........Mostly cloudy. Scattered rain showers and isolated thunderstorms in the evening, then isolated rain showers overnight. * Min temperature.......57-62. * 24 hr trend.........Unchanged. * Max humidity..........75-80 percent. * 24 hr trend.........16 percent drier. * Wind (20 ft) * Plains...............Southwest winds 5 to 10 mph. * Chance of lightning...23 percent. * CWR...................Zero. .WEDNESDAY... * Sky/weather...........Sunny. Patchy smoke in the afternoon. * Max temperature.......87-92. * 24 hr trend.........4 degrees warmer. * Min humidity..........18-23 percent. * 24 hr trend.........7 percent drier. * Wind (20 ft) * Plains...............West winds 5 to 15 mph. * Chance of lightning...2 percent. * CWR...................Less than 10 percent. .WEDNESDAY NIGHT... * Sky/weather...........Partly cloudy. Patchy smoke. * Min temperature.......57-62. * 24 hr trend.........Unchanged. * Max humidity..........59-64 percent. * 24 hr trend.........16 percent drier. * Wind (20 ft) * Plains...............Northwest winds 5 to 10 mph in the evening becoming light overnight. * Chance of lightning...0 percent. * CWR...................Zero. .THURSDAY... * Sky/weather...........Sunny. * Max temperature.......91-96. * 24 hr trend.........4 degrees warmer. * Min humidity..........16-21 percent. * 24 hr trend.........2 percent drier. * Wind (20 ft) * Plains...............Light winds in the morning becoming northeast 5 to 10 mph in the afternoon. * Chance of lightning...0 percent. * CWR...................Zero. .Forecast days 3 through 7...... .THURSDAY NIGHT...Partly cloudy. Lows 60 to 65. East winds 5 to 10 mph. .FRIDAY...Partly cloudy. Lows 63 to 68. Highs 90 to 95. East winds 5 to 15 mph. .SATURDAY...Mostly cloudy. Isolated showers and thunderstorms. Lows 63 to 68. Highs 89 to 94. Southeast winds 5 to 15 mph. .SUNDAY...Partly cloudy. Isolated showers. Lows 60 to 65. Highs 89 to 94. Northwest winds 5 to 10 mph. .MONDAY...Mostly clear. Lows 59 to 64. Highs 87 to 92. .TUESDAY...Mostly sunny. Highs 89 to 94. $$ MTZ131-191015- Northern Cheyenne Indian Reservation/Ashland Ranger District Custer Natl Forest- 1258 PM MDT Tue Aug 18 2026 .Tonight... * Sky/weather...........Mostly cloudy with scattered showers and thunderstorms in the evening, then mostly clear with isolated rain showers overnight. * Min temperature.......53-58. * 24 hr trend.........1 degree cooler. * Max humidity..........80-85 percent. * 24 hr trend.........2 percent wetter. * Wind (20 ft) * Slope/valley.........Southwest winds 5 to 10 mph. * Ridgetop.............Southwest 10 to 15mph. * Chance of lightning...26 percent. * CWR...................20 percent. .WEDNESDAY... * Sky/weather...........Sunny. * Max temperature.......85-90. * 24 hr trend.........4 degrees warmer. * Min humidity..........14-19 percent. * 24 hr trend.........8 percent drier. * Wind (20 ft) * Slope/valley.........West winds 5 to 15 mph. * Ridgetop.............Northwest 10 to 15 mph. * Chance of lightning...1 percent. * CWR...................Zero. .WEDNESDAY NIGHT... * Sky/weather...........Mostly clear. Patchy smoke through the night. * Min temperature.......54-59. * 24 hr trend.........1 degree warmer. * Max humidity..........55-60 percent. * 24 hr trend.........25 percent drier. * Wind (20 ft) * Slope/valley.........Northwest winds 5 to 10 mph in the evening shifting to the southwest overnight. * Ridgetop.............North 10 to 20 mph. * Chance of lightning...0 percent. * CWR...................Zero. .THURSDAY... * Sky/weather...........Sunny. * Max temperature.......91-96. * 24 hr trend.........6 degrees warmer. * Min humidity..........12-17 percent. * 24 hr trend.........2 percent drier. * Wind (20 ft) * Slope/valley.........Southwest winds 5 to 10 mph in the morning shifting to the northwest in the afternoon. * Ridgetop.............North 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .Forecast days 3 through 7...... .THURSDAY NIGHT...Mostly clear. Lows 59 to 64. East winds 5 to 10 mph. .FRIDAY...Mostly clear. Lows 62 to 67. Highs 91 to 96. East winds 5 to 10 mph. .SATURDAY...Mostly cloudy. Isolated showers and thunderstorms. Lows 60 to 65. Highs 90 to 95. Southeast winds 5 to 15 mph. .SUNDAY...Partly cloudy. Isolated showers and thunderstorms. Lows 58 to 63. Highs 88 to 93. North winds 5 to 10 mph. .MONDAY...Mostly clear. Lows 57 to 62. Highs 86 to 91. .TUESDAY...Mostly sunny. Highs 88 to 93. $$ MTZ132-191015- Custer County- 1258 PM MDT Tue Aug 18 2026 .Tonight... * Sky/weather...........Partly cloudy. Isolated showers and thunderstorms in the evening, then isolated rain showers overnight. * Min temperature.......56-61. * 24 hr trend.........Unchanged. * Max humidity..........76-81 percent. * 24 hr trend.........12 percent drier. * Wind (20 ft) * Plains...............North winds 5 to 10 mph in the evening shifting to the southwest overnight. * Chance of lightning...21 percent. * CWR...................Zero. .WEDNESDAY... * Sky/weather...........Sunny. Patchy smoke in the afternoon. * Max temperature.......84-89. * 24 hr trend.........5 degrees warmer. * Min humidity..........21-26 percent. * 24 hr trend.........3 percent drier. * Wind (20 ft) * Plains...............West winds 5 to 15 mph. * Chance of lightning...2 percent. * CWR...................Zero. .WEDNESDAY NIGHT... * Sky/weather...........Mostly clear. Patchy smoke in the evening. * Min temperature.......57-62. * 24 hr trend.........1 degree warmer. * Max humidity..........57-62 percent. * 24 hr trend.........19 percent drier. * Wind (20 ft) * Plains...............West winds 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .THURSDAY... * Sky/weather...........Sunny. * Max temperature.......87-92. * 24 hr trend.........3 degrees warmer. * Min humidity..........20-25 percent. * 24 hr trend.........1 percent drier. * Wind (20 ft) * Plains...............North winds 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .Forecast days 3 through 7...... .THURSDAY NIGHT...Mostly clear. Lows 59 to 64. East winds 5 to 15 mph. .FRIDAY...Mostly clear. Lows 60 to 65. Highs 86 to 91. East winds 5 to 15 mph. .SATURDAY...Mostly cloudy. Scattered showers and isolated thunderstorms. Lows 62 to 67. Highs 85 to 90. Southeast winds 10 to 20 mph. .SUNDAY...Partly cloudy. Isolated showers. Lows 60 to 65. Highs 86 to 91. Northwest winds 5 to 15 mph. .MONDAY...Mostly clear. Lows 59 to 64. Highs 84 to 89. .TUESDAY...Mostly sunny. Highs 86 to 91. $$ MTZ133-191015- Sioux Ranger District Custer National Forest- 1258 PM MDT Tue Aug 18 2026 .Tonight... * Sky/weather...........Mostly cloudy. Scattered rain showers and isolated thunderstorms in the evening, then isolated rain showers overnight. * Min temperature.......55-60. * 24 hr trend.........1 degree cooler. * Max humidity..........81-86 percent. * 24 hr trend.........3 percent wetter. * Wind (20 ft) * Plains...............West winds 5 to 10 mph. * Chance of lightning...22 percent. * CWR...................Less than 10 percent. .WEDNESDAY... * Sky/weather...........Mostly sunny. * Max temperature.......85-90. * 24 hr trend.........4 degrees warmer. * Min humidity..........23-28 percent. * 24 hr trend.........1 percent drier. * Wind (20 ft) * Plains...............West winds 5 to 15 mph. * Chance of lightning...4 percent. * CWR...................Zero. .WEDNESDAY NIGHT... * Sky/weather...........Mostly clear. Patchy smoke. * Min temperature.......57-62. * 24 hr trend.........2 degrees warmer. * Max humidity..........57-62 percent. * 24 hr trend.........24 percent drier. * Wind (20 ft) * Plains...............West winds 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .THURSDAY... * Sky/weather...........Sunny. * Max temperature.......89-94. * 24 hr trend.........4 degrees warmer. * Min humidity..........20-25 percent. * 24 hr trend.........3 percent drier. * Wind (20 ft) * Plains...............Northwest winds 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .Forecast days 3 through 7...... .THURSDAY NIGHT...Mostly clear. Lows 57 to 62. Northeast winds 5 to 10 mph. .FRIDAY...Mostly clear. Lows 58 to 63. Highs 87 to 92. East winds 5 to 15 mph. .SATURDAY...Mostly cloudy. Scattered showers and thunderstorms. Lows 60 to 65. Highs 85 to 90. Southeast winds 15 to 25 mph with gusts to around 35 mph. .SUNDAY...Partly cloudy. Isolated showers and thunderstorms. Lows 60 to 65. Highs 87 to 92. Northwest winds 5 to 15 mph. .MONDAY...Mostly clear. Lows 58 to 63. Highs 86 to 91. .TUESDAY...Mostly sunny. Highs 87 to 92. $$ WYZ274-191015- Sheridan County- 1258 PM MDT Tue Aug 18 2026 .Tonight... * Sky/weather...........Mostly cloudy with scattered rain showers and isolated thunderstorms in the evening, then mostly clear overnight. * Min temperature.......49-54. * 24 hr trend.........4 degrees cooler. * Max humidity..........84-89 percent. * 24 hr trend.........Unchanged. * Wind (20 ft) * Slope/valley.........Southwest winds 5 to 10 mph. * Ridgetop.............Northwest 10 to 20 mph. * Chance of lightning...22 percent. * CWR...................Less than 10 percent. .WEDNESDAY... * Sky/weather...........Sunny. * Max temperature.......84-89. * 24 hr trend.........6 degrees warmer. * Min humidity..........16-21 percent. * 24 hr trend.........10 percent drier. * Wind (20 ft) * Slope/valley.........Northwest winds 5 to 10 mph. * Ridgetop.............North 10 to 15 mph. * Chance of lightning...1 percent. * CWR...................Zero. .WEDNESDAY NIGHT... * Sky/weather...........Mostly clear. * Min temperature.......51-56. * 24 hr trend.........2 degrees warmer. * Max humidity..........68-73 percent. * 24 hr trend.........16 percent drier. * Wind (20 ft) * Slope/valley.........West winds 5 to 10 mph in the evening becoming light overnight. * Ridgetop.............Northeast 5 to 15 mph. * Chance of lightning...0 percent. * CWR...................Zero. .THURSDAY... * Sky/weather...........Sunny. * Max temperature.......89-94. * 24 hr trend.........5 degrees warmer. * Min humidity..........17-22 percent. * 24 hr trend.........1 percent wetter. * Wind (20 ft) * Slope/valley.........Light winds in the morning becoming northeast 5 to 10 mph in the afternoon. * Ridgetop.............Northeast 5 to 10 mph. * Chance of lightning...1 percent. * CWR...................Zero. .Forecast days 3 through 7...... .THURSDAY NIGHT...Mostly clear. Lows 55 to 60. Light winds. .FRIDAY...Partly cloudy. Lows 57 to 62. Highs 90 to 95. Southeast winds 5 to 10 mph. .SATURDAY...Mostly cloudy. Isolated showers and thunderstorms. Lows 57 to 62. Highs 88 to 93. Southwest winds 5 to 10 mph. .SUNDAY...Partly cloudy. Isolated showers and thunderstorms. Lows 54 to 59. Highs 86 to 91. West winds 5 to 10 mph. .MONDAY...Partly cloudy. Lows 54 to 59. Highs 84 to 89. .TUESDAY...Mostly sunny. Isolated showers and thunderstorms. Highs 86 to 91. $$ WYZ284-191015- Bighorn National Forest- 1258 PM MDT Tue Aug 18 2026 .Tonight... * Sky/weather...........Mostly cloudy with scattered rain showers and isolated thunderstorms in the evening, then mostly clear overnight. * Min temperature.......40-45. * 24 hr trend.........4 degrees cooler. * Max humidity..........88-93 percent. * 24 hr trend.........3 percent drier. * Wind (20 ft) * At Burgess Jct.......Southwest winds 5 to 15 mph. * Chance of lightning...21 percent. * CWR...................Less than 10 percent. .WEDNESDAY... * Sky/weather...........Sunny. * Max temperature.......67-72. * 24 hr trend.........3 degrees warmer. * Min humidity..........22-27 percent. * 24 hr trend.........13 percent drier. * Wind (20 ft) * At Burgess Jct.......West winds 5 to 15 mph. * Chance of lightning...1 percent. * CWR...................Zero. .WEDNESDAY NIGHT... * Sky/weather...........Mostly clear. * Min temperature.......44-49. * 24 hr trend.........4 degrees warmer. * Max humidity..........57-62 percent. * 24 hr trend.........31 percent drier. * Wind (20 ft) * At Burgess Jct.......Southwest winds 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .THURSDAY... * Sky/weather...........Sunny. * Max temperature.......72-77. * 24 hr trend.........5 degrees warmer. * Min humidity..........20-25 percent. * 24 hr trend.........2 percent drier. * Wind (20 ft) * At Burgess Jct.......West winds 5 to 15 mph. * Chance of lightning...1 percent. * CWR...................Zero. .Forecast days 3 through 7...... .THURSDAY NIGHT...Partly cloudy. Lows 48 to 53. Southwest winds 5 to 15 mph. .FRIDAY...Partly cloudy. Lows 49 to 54. Highs 73 to 78. Southwest winds 5 to 10 mph. .SATURDAY...Mostly cloudy. Scattered showers and isolated thunderstorms. Lows 47 to 52. Highs 73 to 78. Southwest winds 5 to 15 mph. .SUNDAY...Partly cloudy. Isolated showers and thunderstorms. Lows 45 to 50. Highs 70 to 75. Southwest winds 5 to 15 mph. .MONDAY...Partly cloudy. Isolated showers and thunderstorms. Lows 46 to 51. Highs 69 to 74. .TUESDAY...Mostly sunny. Scattered showers and isolated thunderstorms. Highs 69 to 74. $$ weather.gov/billings