FNUS55 KPSR 232031 FWFPSR Fire Weather Planning Forecast for Southwest and South-Central Arizona and Southeast California National Weather Service Phoenix AZ 131 PM MST Sun Aug 23 2026 .DISCUSSION... Hot and seasonally dry conditions will prevail through the start of the week. Strong gusty winds and thunderstorms will be possible (20-30% chance) late this afternoon and through this evening, mostly across south-central AZ, while chances for wetting rains will be around 15-30%. Minimum RHs will improve through Monday with readings of 15-25% today and 20-30% Monday, before dropping back into the teens as early as Tuesday. Temperatures will be around 5-10 degrees above normal, with lower desert highs eclipsing 110 degrees nearly every afternoon. Outside of thunderstorm outflow winds, 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. AZZ132-240845- 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- 131 PM MST Sun Aug 23 2026 .TONIGHT... * Sky/weather.....................Partly cloudy. Patchy blowing dust in the evening. Slight chance of showers and thunderstorms in the evening. * Min Temperature.................81-91. * 24 hr trend..................3 degrees cooler. * Max Humidity....................50-69 pct. * 24 hr trend..................23 pct wetter. * Winds - 20 foot...Slope/Valley..Southwest 10 to 20 mph in the evening becoming south 5 to 10 mph after midnight. * Winds...10000 FT MSL............Light and variable. * Chance of Precip................20 percent in the evening becoming 10 percent after midnight. * CWR (>= 0.10 IN)................0 percent west portion...20 percent east portion. * Chance of Thunder...............16 percent. .MONDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................103-109. * 24 hr trend..................3 degrees cooler. * Min Humidity....................21-27 pct. * 24 hr trend..................6 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...............5 percent. * Mixing Height for Phoenix.......6900 ft AGL. * Transport Wind for Phoenix......West 6 knots. * Dispersion for Phoenix..........Fair. .MONDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................82-92. * 24 hr trend..................Little change. * Max Humidity....................43-53 pct. * 24 hr trend..................12 pct drier. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph. * Winds...10000 FT MSL............Southeast 5 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............4 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................106-113. * 24 hr trend..................4 degrees warmer. * Min Humidity....................15-19 pct. * 24 hr trend..................8 pct drier. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph. * Winds...10000 FT MSL............Southeast 5 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. * Mixing Height for Phoenix.......13800 ft AGL. * Transport Wind for Phoenix......Southwest 5 knots. * Dispersion for Phoenix..........Marginal. .EXTENDED... .WEDNESDAY...Mostly clear. Lows 85-95. Highs 108-114. Southwest winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .THURSDAY...Mostly clear. Lows 84-94. Highs 108-114. Southwest winds 5 to 15 mph. .FRIDAY...Mostly clear. Lows 84-94. Highs 108-114. Southwest winds 5 to 15 mph. .SATURDAY...Mostly clear. Lows 83-93. Highs 107-113. .SUNDAY...Mostly clear. Lows 82-92. Highs 105-111. $$ AZZ131-CAZ231-240845- Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ- Lower Colorado River Valley CA- 131 PM MST Sun Aug 23 2026 /131 PM PDT Sun Aug 23 2026/ .TONIGHT... * Sky/weather.....................Partly cloudy. * Min Temperature.................83-88. * 24 hr trend..................3 degrees cooler. * Max Humidity....................55-72 pct. * 24 hr trend..................28 pct wetter. * Winds - 20 foot...Slope/Valley..South 10 to 20 mph. * Winds...10000 FT MSL............South 5 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............4 percent. .MONDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................105-110. * 24 hr trend..................Little change. * Min Humidity....................22-27 pct. * 24 hr trend..................5 pct wetter. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............Southeast 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............4 percent. * Mixing Height for Yuma..........7600 ft AGL. * Transport Wind for Yuma.........South 7 knots. * Dispersion for Yuma.............Good. .MONDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................83-88. * 24 hr trend..................Little change. * Max Humidity....................45-55 pct. * 24 hr trend..................14 pct drier. * Winds - 20 foot...Slope/Valley..South 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...............4 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................108-113. * 24 hr trend..................4 degrees warmer. * Min Humidity....................15-19 pct. * 24 hr trend..................8 pct drier. * Winds - 20 foot...Slope/Valley..West 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..........11500 ft AGL. * Transport Wind for Yuma.........Southwest 6 knots. * Dispersion for Yuma.............Fair. .EXTENDED... .WEDNESDAY...Mostly clear. Lows 85-90. Highs 110-115. Southwest winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .THURSDAY...Mostly clear. Lows 85-90. Highs 110-115. South winds 5 to 15 mph. .FRIDAY...Mostly clear. Lows 84-89. Highs 110-115. South winds 5 to 15 mph. .SATURDAY...Mostly clear. Lows 84-89. Highs 109-114. .SUNDAY...Mostly clear. Lows 84-89. Highs 108-113. $$ AZZ133-240845- Southern Gila County/Tonto National Forest Foothills- Southern Tonto NF/West San Carlos BIA/South Portion Ft Apache BIA/ CAZ- 131 PM MST Sun Aug 23 2026 .TONIGHT... * Sky/weather.....................Partly cloudy. Slight chance of showers and thunderstorms in the evening. * Min Temperature.................66-83. * 24 hr trend..................Little change. * Max Humidity....................46-58 pct. * 24 hr trend..................8 pct wetter. * Winds - 20 foot...Slope/Valley..Northwest 5 to 15 mph. * Winds...10000 FT MSL............Northwest 5 to 15 mph in the evening becoming north after midnight. * Chance of Precip................20 percent in the evening becoming 0 percent after midnight. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............13 percent. .MONDAY... * Sky/weather.....................Partly sunny. * Max Temperature.................92-106. * 24 hr trend..................Little change. * Min Humidity....................18-27 pct. * 24 hr trend..................4 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 southeast in the afternoon. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............6 percent. .MONDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................66-82. * 24 hr trend..................Little change. * Max Humidity....................41-55 pct. * 24 hr trend..................5 pct drier. * Winds - 20 foot...Slope/Valley..North 5 to 15 mph. * Winds...10000 FT MSL............Light and variable. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............5 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................94-109. * 24 hr trend..................3 degrees warmer. * Min Humidity....................14-20 pct. * 24 hr trend..................5 pct drier. * Winds - 20 foot...Slope/Valley..Northeast 5 to 10 mph in the morning becoming west in the afternoon. * Winds...10000 FT MSL............Southeast 5 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............2 percent. .EXTENDED... .WEDNESDAY...Mostly clear. Lows 67-86. Highs 94-110. North winds 5 to 15 mph. .THURSDAY...Mostly clear. Lows 68-86. Highs 94-110. North winds 5 to 15 mph. .FRIDAY...Mostly clear. Lows 68-86. Highs 94-109. North winds 5 to 15 mph. .SATURDAY...Mostly clear. Lows 68-85. Highs 94-109. .SUNDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 67-85. Highs 92-107. $$ CAZ232-240845- Imperial County And Eastern Riverside County- 131 PM PDT Sun Aug 23 2026 .TONIGHT... * Sky/weather.....................Partly cloudy. * Min Temperature.................82-89. * 24 hr trend..................3 degrees cooler. * Max Humidity....................44-77 pct. * 24 hr trend..................29 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...............3 percent. .MONDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................101-110. * 24 hr trend..................4 degrees cooler. * Min Humidity....................20-27 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 morning becoming south 5 to 15 mph in the afternoon. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............4 percent. .MONDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................83-90. * 24 hr trend..................Little change. * Max Humidity....................34-53 pct. * 24 hr trend..................17 pct drier. * Winds - 20 foot...Slope/Valley..Southwest 5 to 10 mph in the evening becoming west after midnight. * Winds...10000 FT MSL............Light and variable in the evening becoming east 5 to 15 mph after midnight. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............4 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................104-113. * 24 hr trend..................3 degrees warmer. * Min Humidity....................14-21 pct. * 24 hr trend..................6 pct drier. * Winds - 20 foot...Slope/Valley..Northwest 5 to 10 mph in the morning becoming southwest in the afternoon. * 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...............2 percent. .EXTENDED... .WEDNESDAY...Mostly clear. Lows 86-92. Highs 105-115. West winds 5 to 15 mph. .THURSDAY...Mostly clear. Lows 86-92. Highs 105-115. Southwest winds 5 to 15 mph. .FRIDAY...Mostly clear. Lows 85-92. Highs 105-115. South winds 5 to 15 mph. .SATURDAY...Mostly clear. Lows 84-91. Highs 105-115. .SUNDAY...Mostly clear. Lows 82-90. Highs 104-113. $$ CAZ230-240845- Joshua Tree National Park- 131 PM PDT Sun Aug 23 2026 .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................73-86. * 24 hr trend..................Little change. * Max Humidity....................29-43 pct. * 24 hr trend..................6 pct wetter. * Winds - 20 foot...Slope/Valley..Southwest 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...............3 percent. .MONDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................91-105. * 24 hr trend..................4 degrees cooler. * Min Humidity....................18-25 pct. * 24 hr trend..................8 pct wetter. * 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................10 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............8 percent. .MONDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................73-86. * 24 hr trend..................Little change. * Max Humidity....................30-38 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph. * Winds...10000 FT MSL............Light and variable. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............3 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................94-107. * 24 hr trend..................Little change. * Min Humidity....................15-21 pct. * 24 hr trend..................3 pct drier. * Winds - 20 foot...Slope/Valley..Northwest 5 to 10 mph in the morning becoming south in the afternoon. * Winds...10000 FT MSL............South 5 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............3 percent. .EXTENDED... .WEDNESDAY...Mostly clear. Lows 75-88. Highs 95-109. West winds 5 to 15 mph. .THURSDAY...Mostly clear. Lows 75-88. Highs 95-109. West winds 5 to 15 mph. .FRIDAY...Mostly clear. Lows 74-88. Highs 95-109. West winds 5 to 15 mph. .SATURDAY...Mostly clear. Lows 73-87. Highs 95-108. .SUNDAY...Mostly clear. Lows 71-86. Highs 93-107. $$ .8 TO 10 DAY OUTLOOK...Monday August 31st through Wednesday September 2nd: Above normal temperatures and near median precipitation.