Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Phoenix, AZ
Issued by NWS Phoenix, AZ
823 FNUS55 KPSR 172026 FWFPSR Fire Weather Planning Forecast for Southwest and South-Central Arizona and Southeast California National Weather Service Phoenix AZ 126 PM MST Mon Aug 17 2026 .DISCUSSION... Above normal temperatures with a steady increase in low-level moisture is anticipated over the next few days. Most lower desert communities will see temperatures topping out around 110-113 degrees. Widely scattered showers and thunderstorms are forecast for the high terrain through Tuesday with an increase in coverage expected by midweek. Relative humidity values will bottom out between 15-25% through Tuesday before increasing to 20-30% starting Wednesday. Outside of gusty and erratic winds near any thunderstorm, overall winds will follow the typical diurnal tendencies with some modest afternoon upslope gustiness. ...Thunderstorms imply gusty winds... Note...Additional Fire Weather Forecast information can be found in the Area Forecast Discussion. See product PHXAFDPSR. AZZ132-180830- West Central Deserts/Northwest Maricopa County/Greater Phoenix Area/Southwest Deserts/Southwest Maricopa County/ Northwest and North-Central Pinal County- Phoenix BLM/YUM BLM/CAZ-CRZ- 126 PM MST Mon Aug 17 2026 .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................83-93. * 24 hr trend..................Little change. * Max Humidity....................29-39 pct. * 24 hr trend..................4 pct drier. * Winds - 20 foot...Slope/Valley..West 5 to 10 mph in the evening becoming southeast after midnight. * Winds...10000 FT MSL............Light and variable in the evening becoming southeast 5 to 15 mph after midnight. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............1 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................106-112. * 24 hr trend..................Little change. * Min Humidity....................15-19 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............Southeast 5 to 15 mph in the morning becoming light and variable in the afternoon. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............1 percent. * Mixing Height for Phoenix.......10700 ft AGL. * Transport Wind for Phoenix......Southwest 5 knots. * Dispersion for Phoenix..........Poor. .TUESDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................82-92. * 24 hr trend..................Little change. * Max Humidity....................40-61 pct. * 24 hr trend..................14 pct wetter. * Winds - 20 foot...Slope/Valley..Southwest 5 to 15 mph. * Winds...10000 FT MSL............East 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .WEDNESDAY... * Sky/weather.....................Sunny. * Max Temperature.................104-110. * 24 hr trend..................Little change. * Min Humidity....................18-25 pct. * 24 hr trend..................4 pct wetter. * Winds - 20 foot...Slope/Valley..Southwest 5 to 15 mph. * Winds...10000 FT MSL............East 5 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. * Mixing Height for Phoenix.......9600 ft AGL. * Transport Wind for Phoenix......West 8 knots. * Dispersion for Phoenix..........Very good. .EXTENDED... .THURSDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 82-92. Highs 104-111. Southwest winds 10 to 20 mph. .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 82-92. Highs 105-112. Southwest winds 5 to 10 mph. .SATURDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 83-93. Highs 105-112. Southwest winds 5 to 10 mph. .SUNDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 82-92. Highs 104-110. .MONDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 81-91. Highs 102-108. $$ AZZ131-CAZ231-180830- Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ- Lower Colorado River Valley CA- 126 PM MST Mon Aug 17 2026 /126 PM PDT Mon Aug 17 2026/ .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................83-88. * 24 hr trend..................Little change. * Max Humidity....................28-38 pct. * 24 hr trend..................6 pct drier. * Winds - 20 foot...Slope/Valley..Southwest 5 to 15 mph. * Winds...10000 FT MSL............South 5 to 15 mph in the evening becoming 15 to 25 mph after midnight. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............1 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................108-113. * 24 hr trend..................Little change. * Min Humidity....................15-20 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............South 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............1 percent. * Mixing Height for Yuma..........6900 ft AGL. * Transport Wind for Yuma.........South 9 knots. * Dispersion for Yuma.............Good. .TUESDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................82-87. * 24 hr trend..................Little change. * Max Humidity....................46-68 pct. * 24 hr trend..................21 pct wetter. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............Light and variable in the evening becoming southeast 5 to 15 mph after midnight. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .WEDNESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................106-111. * 24 hr trend..................Little change. * Min Humidity....................22-28 pct. * 24 hr trend..................7 pct wetter. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............Southeast 5 to 15 mph in the morning becoming light and variable in the afternoon. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. * Mixing Height for Yuma..........7100 ft AGL. * Transport Wind for Yuma.........South 12 knots. * Dispersion for Yuma.............Good. .EXTENDED... .THURSDAY...Mostly clear. Lows 83-88. Highs 106-111. South winds 10 to 20 mph. .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 84-89. Highs 108-113. South winds 5 to 15 mph. .SATURDAY...Mostly clear. Lows 84-89. Highs 108-113. South winds 5 to 15 mph. .SUNDAY...Mostly clear. Lows 84-89. Highs 107-112. .MONDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 82-87. Highs 105-110. $$ AZZ133-180830- Southern Gila County/Tonto National Forest Foothills- Southern Tonto NF/West San Carlos BIA/South Portion Ft Apache BIA/ CAZ- 126 PM MST Mon Aug 17 2026 .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................67-84. * 24 hr trend..................Little change. * Max Humidity....................38-60 pct. * 24 hr trend..................3 pct wetter. * Winds - 20 foot...Slope/Valley..East 5 to 15 mph. * Winds...10000 FT MSL............North 5 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............8 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. Slight chance of showers and thunderstorms in the afternoon. * Max Temperature.................90-106. * 24 hr trend..................Little change. * Min Humidity....................16-27 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Southeast 5 to 15 mph. * Winds...10000 FT MSL............East 5 to 15 mph. * Chance of Precip................0 percent in the morning becoming 20 percent in the afternoon. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............16 percent. .TUESDAY NIGHT... * Sky/weather.....................Partly cloudy. Slight chance of showers and thunderstorms in the evening. * Min Temperature.................67-84. * 24 hr trend..................Little change. * Max Humidity....................40-59 pct. * 24 hr trend..................Little change. * Winds - 20 foot...Slope/Valley..Northeast 5 to 15 mph. * Winds...10000 FT MSL............East 5 to 15 mph. * Chance of Precip................10 percent in the evening becoming 0 percent after midnight. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............14 percent. .WEDNESDAY... * Sky/weather.....................Mostly sunny. Slight chance of showers and thunderstorms in the afternoon. * Max Temperature.................91-106. * 24 hr trend..................Little change. * Min Humidity....................18-26 pct. * 24 hr trend..................Little change. * Winds - 20 foot...Slope/Valley..South 5 to 10 mph in the morning becoming west in the afternoon. * Winds...10000 FT MSL............North 5 to 15 mph in the morning becoming light and variable in the afternoon. * Chance of Precip................0 percent in the morning becoming 10 percent in the afternoon. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............13 percent. .EXTENDED... .THURSDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 66-84. Highs 91-106. Northwest winds 5 to 15 mph. .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 66-83. Highs 92-107. North winds 5 to 15 mph. .SATURDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 66-83. Highs 92-107. East winds 5 to 15 mph. .SUNDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 66-83. Highs 91-105. .MONDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 66-83. Highs 90-104. $$ CAZ232-180830- Imperial County And Eastern Riverside County- 126 PM PDT Mon Aug 17 2026 .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................84-89. * 24 hr trend..................Little change. * Max Humidity....................24-37 pct. * 24 hr trend..................6 pct drier. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph. * Winds...10000 FT MSL............South 5 to 15 mph in the evening becoming 15 to 25 mph after midnight. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............1 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................103-113. * 24 hr trend..................Little change. * Min Humidity....................13-19 pct. * 24 hr trend..................Little change. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............South 15 to 25 mph in the morning becoming 5 to 15 mph in the afternoon. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............1 percent. .TUESDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................83-89. * 24 hr trend..................Little change. * Max Humidity....................30-67 pct. * 24 hr trend..................16 pct wetter. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............South 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .WEDNESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................102-111. * 24 hr trend..................Little change. * Min Humidity....................20-27 pct. * 24 hr trend..................7 pct wetter. * Winds - 20 foot...Slope/Valley..Southeast 5 to 15 mph. * Winds...10000 FT MSL............South 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .EXTENDED... .THURSDAY...Mostly clear. Lows 82-90. Highs 102-111. South winds 10 to 20 mph. .FRIDAY...Mostly clear with slight chance of showers. Lows 83-90. Highs 102-112. South winds 5 to 15 mph. .SATURDAY...Mostly clear. Lows 84-90. Highs 103-112. Southwest winds 5 to 15 mph. .SUNDAY...Mostly clear. Lows 83-90. Highs 102-111. .MONDAY...Mostly clear. Lows 82-89. Highs 100-110. $$ CAZ230-180830- Joshua Tree National Park- 126 PM PDT Mon Aug 17 2026 .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................73-85. * 24 hr trend..................Little change. * Max Humidity....................26-33 pct. * 24 hr trend..................8 pct drier. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph. * Winds...10000 FT MSL............Light and variable in the evening becoming south 10 to 20 mph after midnight. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................93-107. * 24 hr trend..................Little change. * Min Humidity....................14-20 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............South 15 to 25 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............1 percent. .TUESDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................74-86. * 24 hr trend..................Little change. * Max Humidity....................28-35 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph. * Winds...10000 FT MSL............Light and variable in the evening becoming south 5 to 15 mph after midnight. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .WEDNESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................93-106. * 24 hr trend..................Little change. * Min Humidity....................18-25 pct. * 24 hr trend..................4 pct wetter. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............South 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .EXTENDED... .THURSDAY...Mostly clear. Lows 74-86. Highs 92-106. Southwest winds 5 to 15 mph. .FRIDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 74-86. Highs 92-106. Southwest winds 5 to 15 mph. .SATURDAY...Mostly clear. Lows 73-86. Highs 92-106. Southwest winds 5 to 15 mph. .SUNDAY...Mostly clear. Lows 72-86. Highs 91-106. .MONDAY...Mostly clear. Lows 71-85. Highs 90-104. $$ .8 TO 10 DAY OUTLOOK...Tuesday August 25th through Thursday August 27th: Above normal temperatures and near to above median precipitation.