Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Phoenix, AZ
Issued by NWS Phoenix, AZ
395 FNUS55 KPSR 212143 FWFPSR Fire Weather Planning Forecast for Southwest and South-Central Arizona and Southeast California National Weather Service Phoenix AZ 243 PM MST Fri Aug 21 2026 .DISCUSSION... Hot and seasonally dry conditions are expected through this weekend. Aside from a brief increase in moisture Sunday into Monday, minimum RH values each afternoon will be around 12-18% (15-25% Sun-Mon). Temperatures will range 5-8 degrees above normal this weekend, with lower desert highs reaching or eclipsing 110 degrees. There will be slight chances for storms each afternoon through this weekend, but mostly favoring higher terrain areas. 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. AZZ132-220945- 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- 243 PM MST Fri Aug 21 2026 .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................84-94. * 24 hr trend..................Little change. * Max Humidity....................30-38 pct. * 24 hr trend..................13 pct drier. * Winds - 20 foot...Slope/Valley..West 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...............2 percent. .SATURDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................108-115. * 24 hr trend..................Little change. * Min Humidity....................12-16 pct. * 24 hr trend..................Little RH change. * 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 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.......15300 ft AGL. * Transport Wind for Phoenix......Southwest 5 knots. * Dispersion for Phoenix..........Good. .SATURDAY NIGHT... * Sky/weather.....................Partly cloudy. * Min Temperature.................84-94. * 24 hr trend..................Little change. * Max Humidity....................29-40 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..West 5 to 10 mph in the evening becoming south 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...............3 percent. .SUNDAY... * Sky/weather.....................Mostly sunny. Slight chance of showers and thunderstorms in the afternoon. * Max Temperature.................105-111. * 24 hr trend..................3 degrees cooler. * Min Humidity....................17-23 pct. * 24 hr trend..................5 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................10 percent in the morning becoming 0 percent in the afternoon. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............6 percent. * Mixing Height for Phoenix.......14000 ft AGL. * Transport Wind for Phoenix......West 7 knots. * Dispersion for Phoenix..........Excellent. .EXTENDED... .MONDAY...Mostly clear. Lows 82-92. Highs 105-111. Southwest winds 5 to 15 mph. .TUESDAY...Mostly clear. Lows 83-93. Highs 107-114. West winds 5 to 10 mph. .WEDNESDAY...Mostly clear. Lows 83-93. Highs 108-115. Southwest winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .THURSDAY...Mostly clear. Lows 83-93. Highs 107-113. .FRIDAY...Mostly clear. Lows 83-93. Highs 107-114. $$ AZZ131-CAZ231-220945- Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ- Lower Colorado River Valley CA- 243 PM MST Fri Aug 21 2026 /243 PM PDT Fri Aug 21 2026/ .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................84-89. * 24 hr trend..................Little change. * Max Humidity....................31-39 pct. * 24 hr trend..................15 pct drier. * 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...............1 percent. .SATURDAY... * Sky/weather.....................Sunny. * Max Temperature.................111-116. * 24 hr trend..................Little change. * Min Humidity....................12-16 pct. * 24 hr trend..................3 pct drier. * Winds - 20 foot...Slope/Valley..Northwest 5 to 10 mph in the morning becoming southwest in the afternoon. * 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..........15600 ft AGL. * Transport Wind for Yuma.........Southwest 6 knots. * Dispersion for Yuma.............Very good. .SATURDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................84-89. * 24 hr trend..................Little change. * Max Humidity....................29-42 pct. * 24 hr trend..................Little RH change. * 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...............1 percent. .SUNDAY... * Sky/weather.....................Mostly sunny. Slight chance of showers . slight chance of thunderstorms in the afternoon. * Max Temperature.................108-113. * 24 hr trend..................3 degrees cooler. * Min Humidity....................16-24 pct. * 24 hr trend..................6 pct wetter. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............South 10 to 20 mph. * Chance of Precip................10 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............8 percent. * Mixing Height for Yuma..........10100 ft AGL. * Transport Wind for Yuma.........South 10 knots. * Dispersion for Yuma.............Very good. .EXTENDED... .MONDAY...Mostly clear. Lows 83-88. Highs 106-111. South winds 5 to 15 mph. .TUESDAY...Mostly clear. Lows 85-90. Highs 110-115. Southwest winds 5 to 10 mph. .WEDNESDAY...Mostly clear. Lows 85-90. Highs 111-116. Southwest winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .THURSDAY...Mostly clear. Lows 84-89. Highs 109-114. .FRIDAY...Mostly clear. Lows 84-89. Highs 109-114. $$ AZZ133-220945- Southern Gila County/Tonto National Forest Foothills- Southern Tonto NF/West San Carlos BIA/South Portion Ft Apache BIA/ CAZ- 243 PM MST Fri Aug 21 2026 .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................67-84. * 24 hr trend..................Little change. * Max Humidity....................34-52 pct. * 24 hr trend..................14 pct drier. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph in the evening becoming northeast 5 to 10 mph after midnight. * Winds...10000 FT MSL............Light and variable. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............3 percent. .SATURDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................94-109. * 24 hr trend..................Little change. * Min Humidity....................13-19 pct. * 24 hr trend..................Little RH change. * 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 in the morning becoming south in the afternoon. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............8 percent. .SATURDAY 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....................35-52 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Northeast 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...............8 percent. .SUNDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................92-107. * 24 hr trend..................Little change. * Min Humidity....................15-22 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..East 5 to 10 mph in the morning becoming west in the afternoon. * Winds...10000 FT MSL............Light and variable. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............5 percent. .EXTENDED... .MONDAY...Partly cloudy. Lows 67-84. Highs 93-107. Northwest winds 5 to 15 mph. .TUESDAY...Mostly clear. Lows 67-85. Highs 94-110. Northwest winds 5 to 15 mph. .WEDNESDAY...Mostly clear. Lows 67-85. Highs 95-110. Northwest winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .THURSDAY...Mostly clear. Lows 67-85. Highs 95-110. .FRIDAY...Mostly clear. Lows 68-85. Highs 95-110. $$ CAZ232-220945- Imperial County And Eastern Riverside County- 243 PM PDT Fri Aug 21 2026 .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................84-90. * 24 hr trend..................Little change. * Max Humidity....................27-40 pct. * 24 hr trend..................14 pct drier. * 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...............1 percent. .SATURDAY... * Sky/weather.....................Sunny. * Max Temperature.................105-115. * 24 hr trend..................Little change. * Min Humidity....................12-18 pct. * 24 hr trend..................3 pct drier. * Winds - 20 foot...Slope/Valley..Northwest 5 to 10 mph in the morning becoming southwest in the afternoon. * 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. .SATURDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................85-91. * 24 hr trend..................Little change. * Max Humidity....................25-39 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..West 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. .SUNDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................104-113. * 24 hr trend..................Little change. * Min Humidity....................14-21 pct. * 24 hr trend..................3 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...............6 percent. .EXTENDED... .MONDAY...Mostly clear. Lows 83-90. Highs 102-111. South winds 5 to 15 mph. .TUESDAY...Mostly clear. Lows 84-91. Highs 104-114. West winds 5 to 10 mph. .WEDNESDAY...Mostly clear. Lows 84-91. Highs 105-115. Southwest winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .THURSDAY...Mostly clear. Lows 84-90. Highs 104-114. .FRIDAY...Mostly clear. Lows 84-90. Highs 104-114. $$ CAZ230-220945- Joshua Tree National Park- 243 PM PDT Fri Aug 21 2026 .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................74-87. * 24 hr trend..................Little change. * Max Humidity....................29-37 pct. * 24 hr trend..................13 pct drier. * 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...............2 percent. .SATURDAY... * Sky/weather.....................Sunny. * Max Temperature.................95-108. * 24 hr trend..................Little change. * Min Humidity....................13-19 pct. * 24 hr trend..................4 pct drier. * Winds - 20 foot...Slope/Valley..Northwest 5 to 10 mph in the morning becoming southwest 5 to 15 mph in the afternoon. * 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. .SATURDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................74-86. * 24 hr trend..................Little change. * Max Humidity....................27-34 pct. * 24 hr trend..................3 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...............1 percent. .SUNDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................93-107. * 24 hr trend..................Little change. * Min Humidity....................14-19 pct. * 24 hr trend..................Little change. * Winds - 20 foot...Slope/Valley..West 5 to 10 mph in the morning becoming south 5 to 15 mph in the afternoon. * Winds...10000 FT MSL............Southwest 15 to 25 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............3 percent. .EXTENDED... .MONDAY...Mostly clear. Lows 73-86. Highs 92-106. Southwest winds 5 to 15 mph. .TUESDAY...Mostly clear. Lows 73-87. Highs 94-108. West winds 5 to 15 mph. .WEDNESDAY...Mostly clear. Lows 74-87. Highs 95-109. West winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .THURSDAY...Mostly clear. Lows 74-86. Highs 94-108. .FRIDAY...Mostly clear. Lows 74-86. Highs 94-108. $$ .8 TO 10 DAY OUTLOOK...Saturday August 29th through Monday August 31st: Above normal temperatures and near median precipitation.