Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Phoenix, AZ
Issued by NWS Phoenix, AZ
164 FNUS55 KPSR 181924 FWFPSR Fire Weather Planning Forecast for Southwest and South-Central Arizona and Southeast California National Weather Service Phoenix AZ 1224 PM MST Tue Aug 18 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 afternoon high temperatures topping out around 108-113 degrees. Widely scattered showers and storms are forecast for the AZ high terrain today with an increase in coverage, including the lower deserts expected Wednesday into Thursday. Relative humidity values of 15-25% today will increase to 20-30% starting Wednesday with continued fair to good overnight recoveries. 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. AZZ132-190730- 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- 1224 PM MST Tue Aug 18 2026 .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................82-92. * 24 hr trend..................Little change. * Max Humidity....................44-63 pct. * 24 hr trend..................19 pct wetter. * Winds - 20 foot...Slope/Valley..Southwest 5 to 15 mph. * Winds...10000 FT MSL............Northeast 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............1 percent. .WEDNESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................104-110. * 24 hr trend..................Little change. * Min Humidity....................19-25 pct. * 24 hr trend..................5 pct wetter. * Winds - 20 foot...Slope/Valley..Southwest 5 to 15 mph. * Winds...10000 FT MSL............East 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...............2 percent. * Mixing Height for Phoenix.......9900 ft AGL. * Transport Wind for Phoenix......West 9 knots. * Dispersion for Phoenix..........Very good. .WEDNESDAY NIGHT... * Sky/weather.....................Partly cloudy. Slight chance of showers and thunderstorms in the evening. * Min Temperature.................82-92. * 24 hr trend..................Little change. * Max Humidity....................47-61 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Southwest 5 to 15 mph. * Winds...10000 FT MSL............Light and variable. * Chance of Precip................10 percent in the evening becoming 0 percent after midnight. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............13 percent. .THURSDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................104-110. * 24 hr trend..................Little change. * Min Humidity....................22-26 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..South 5 to 10 mph in the morning becoming southwest in the afternoon. * Winds...10000 FT MSL............Northeast 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...............6 percent. * Mixing Height for Phoenix.......9800 ft AGL. * Transport Wind for Phoenix......West 7 knots. * Dispersion for Phoenix..........Good. .EXTENDED... .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 82-92. Highs 104-111. South winds 5 to 10 mph. .SATURDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 82-92. Highs 105-112. South winds 5 to 10 mph. .SUNDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 81-91. Highs 103-109. South winds 5 to 15 mph. .MONDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 81-91. Highs 101-107. .TUESDAY...Mostly clear. Lows 81-91. Highs 103-109. $$ AZZ131-CAZ231-190730- Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ- Lower Colorado River Valley CA- 1224 PM MST Tue Aug 18 2026 /1224 PM PDT Tue Aug 18 2026/ .TONIGHT... * Sky/weather.....................Partly cloudy. * Min Temperature.................83-88. * 24 hr trend..................Little change. * Max Humidity....................50-72 pct. * 24 hr trend..................27 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...............1 percent. .WEDNESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................106-111. * 24 hr trend..................Little change. * Min Humidity....................22-28 pct. * 24 hr trend..................8 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...............1 percent. * Mixing Height for Yuma..........5800 ft AGL. * Transport Wind for Yuma.........South 11 knots. * Dispersion for Yuma.............Good. .WEDNESDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................83-88. * 24 hr trend..................Little change. * Max Humidity....................53-68 pct. * 24 hr trend..................Little change. * Winds - 20 foot...Slope/Valley..South 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...............1 percent. .THURSDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................106-111. * 24 hr trend..................Little change. * Min Humidity....................23-27 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............South 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 Yuma..........8500 ft AGL. * Transport Wind for Yuma.........South 10 knots. * Dispersion for Yuma.............Good. .EXTENDED... .FRIDAY...Mostly clear. Lows 83-88. Highs 107-112. South winds 5 to 15 mph. .SATURDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 83-88. Highs 108-113. South winds 5 to 15 mph. .SUNDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 83-88. Highs 106-111. South winds 5 to 15 mph. .MONDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 83-88. Highs 104-109. .TUESDAY...Mostly clear. Lows 83-88. Highs 105-110. $$ AZZ133-190730- Southern Gila County/Tonto National Forest Foothills- Southern Tonto NF/West San Carlos BIA/South Portion Ft Apache BIA/ CAZ- 1224 PM MST Tue Aug 18 2026 .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................67-84. * 24 hr trend..................Little change. * Max Humidity....................43-61 pct. * 24 hr trend..................4 pct wetter. * Winds - 20 foot...Slope/Valley..Northeast 5 to 10 mph in the evening becoming southeast after midnight. * Winds...10000 FT MSL............Northeast 5 to 15 mph in the evening becoming light and variable after midnight. * Chance of Precip................10 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............11 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....................18-27 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph. * Winds...10000 FT MSL............North 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...............21 percent. .WEDNESDAY NIGHT... * Sky/weather.....................Partly cloudy. Slight chance of showers and thunderstorms in the evening. * Min Temperature.................66-83. * 24 hr trend..................Little change. * Max Humidity....................47-66 pct. * 24 hr trend..................5 pct wetter. * Winds - 20 foot...Slope/Valley..Northeast 5 to 15 mph. * Winds...10000 FT MSL............Northwest 5 to 15 mph in the evening becoming north 10 to 20 mph after midnight. * Chance of Precip................20 percent in the evening becoming 0 percent after midnight. * CWR (>= 0.10 IN)................10 percent. * Chance of Thunder...............22 percent. .THURSDAY... * Sky/weather.....................Partly sunny. Slight chance of showers and thunderstorms in the afternoon. * Max Temperature.................91-105. * 24 hr trend..................Little change. * Min Humidity....................21-31 pct. * 24 hr trend..................3 pct wetter. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph. * Winds...10000 FT MSL............Northeast 5 to 15 mph in the morning becoming light and variable in the afternoon. * Chance of Precip................0 percent in the morning becoming 20 percent in the afternoon. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............18 percent. .EXTENDED... .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 65-83. Highs 91-106. Northeast 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...Partly cloudy with slight chance of showers and thunderstorms. Lows 66-82. Highs 90-105. West winds 5 to 15 mph. .MONDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 66-82. Highs 90-104. .TUESDAY...Mostly clear. Lows 66-83. Highs 91-106. $$ CAZ232-190730- Imperial County And Eastern Riverside County- 1224 PM PDT Tue Aug 18 2026 .TONIGHT... * Sky/weather.....................Partly cloudy. * Min Temperature.................82-88. * 24 hr trend..................Little change. * Max Humidity....................31-72 pct. * 24 hr trend..................23 pct wetter. * Winds - 20 foot...Slope/Valley..South 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...............1 percent. .WEDNESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................102-112. * 24 hr trend..................Little change. * Min Humidity....................19-28 pct. * 24 hr trend..................9 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. .WEDNESDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................82-89. * 24 hr trend..................Little change. * Max Humidity....................45-72 pct. * 24 hr trend..................8 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. .THURSDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................102-111. * 24 hr trend..................Little change. * Min Humidity....................22-29 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. .EXTENDED... .FRIDAY...Mostly clear. Lows 83-89. Highs 102-111. South winds 5 to 15 mph. .SATURDAY...Mostly clear. Lows 83-89. Highs 103-112. South winds 5 to 15 mph. .SUNDAY...Mostly clear with slight chance of showers. Lows 82-89. Highs 101-111. South winds 5 to 15 mph. .MONDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 82-88. Highs 99-108. .TUESDAY...Mostly clear. Lows 82-89. Highs 100-110. $$ CAZ230-190730- Joshua Tree National Park- 1224 PM PDT Tue Aug 18 2026 .TONIGHT... * Sky/weather.....................Partly cloudy. * Min Temperature.................74-85. * 24 hr trend..................Little change. * Max Humidity....................27-35 pct. * 24 hr trend..................4 pct wetter. * Winds - 20 foot...Slope/Valley..Southwest 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.................93-107. * 24 hr trend..................Little change. * Min Humidity....................17-24 pct. * 24 hr trend..................5 pct wetter. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............Southwest 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .WEDNESDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................74-86. * 24 hr trend..................Little change. * Max Humidity....................42-56 pct. * 24 hr trend..................17 pct wetter. * Winds - 20 foot...Slope/Valley..Southwest 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. .THURSDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................92-106. * 24 hr trend..................Little change. * Min Humidity....................21-30 pct. * 24 hr trend..................5 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...............1 percent. .EXTENDED... .FRIDAY...Mostly clear. Lows 73-86. Highs 91-106. Southwest winds 5 to 15 mph. .SATURDAY...Mostly clear. Lows 73-85. Highs 92-106. Southwest winds 5 to 15 mph. .SUNDAY...Mostly clear with slight chance of showers. Lows 72-85. Highs 91-105. Southwest winds 5 to 15 mph. .MONDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 72-84. Highs 89-103. .TUESDAY...Mostly clear. Lows 72-85. Highs 90-104. $$ .8 TO 10 DAY OUTLOOK...Wednesday August 26th through Friday August 28th: Above normal temperatures and near median precipitation.