FNUS55 KPSR 200818 FWFPSR Fire Weather Planning Forecast for Southwest and South-Central Arizona and Southeast California National Weather Service Phoenix AZ 118 AM MST Wed May 20 2026 .DISCUSSION... Under continued dry and well mixed conditions, temperatures will hover around the seasonal normal through Thursday. Minimum afternoon humidity levels in a 5-15% range will be common following poor to fair overnight recovery of 15-35%. Winds will maintain a nocturnal drainage/diurnal upslope component with frequent afternoon gusts 15-25 mph. ...Thunderstorms imply gusty winds... Note...Additional Fire Weather Forecast information can be found in the Area Forecast Discussion. See product PHXAFDPSR. AZZ132-202030- 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- 118 AM MST Wed May 20 2026 .TODAY... * Sky/weather.....................Sunny. * Max Temperature.................88-94. * 24 hr trend..................4 degrees warmer. * Min Humidity....................5-9 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Southwest 5 to 15 mph. * Winds...10000 FT MSL............Southwest 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. * Mixing Height for Phoenix.......10300 ft AGL. * Transport Wind for Phoenix......Southwest 8 knots. * Dispersion for Phoenix..........Very good. .TONIGHT... * Sky/weather.....................Clear. * Min Temperature.................59-69. * 24 hr trend..................Little change. * Max Humidity....................18-34 pct. * 24 hr trend..................4 pct wetter. * Winds - 20 foot...Slope/Valley..Southwest 5 to 10 mph in the evening becoming southeast after midnight. * Winds...10000 FT MSL............West 5 to 15 mph in the evening becoming light and variable after midnight. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .THURSDAY... * Sky/weather.....................Sunny. * Max Temperature.................90-96. * 24 hr trend..................Little change. * Min Humidity....................6-10 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Southeast 5 to 10 mph in the morning becoming southwest in the afternoon. * Winds...10000 FT MSL............Southwest 5 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. * Mixing Height for Phoenix.......11200 ft AGL. * Transport Wind for Phoenix......West 5 knots. * Dispersion for Phoenix..........Good. .EXTENDED... .FRIDAY...Clear. Lows 61-71. Highs 91-97. South winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .SATURDAY...Clear. Lows 63-73. Highs 91-97. Southwest winds 5 to 15 mph. .SUNDAY...Clear. Lows 64-74. Highs 95-100. Southwest winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .MONDAY...Clear. Lows 64-74. Highs 95-101. .TUESDAY...Clear. Lows 62-72. Highs 92-98. $$ AZZ131-CAZ231-202030- Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ- Lower Colorado River Valley CA- 118 AM MST Wed May 20 2026 /118 AM PDT Wed May 20 2026/ .TODAY... * Sky/weather.....................Sunny. * Max Temperature.................91-96. * 24 hr trend..................6 degrees warmer. * Min Humidity....................5-9 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..North 5 to 15 mph. * Winds...10000 FT MSL............North 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. * Mixing Height for Yuma..........12000 ft AGL. * Transport Wind for Yuma.........Northwest 9 knots. * Dispersion for Yuma.............Excellent. .TONIGHT... * Sky/weather.....................Clear. * Min Temperature.................59-64. * 24 hr trend..................Little change. * Max Humidity....................25-48 pct. * 24 hr trend..................12 pct wetter. * Winds - 20 foot...Slope/Valley..Southwest 5 to 10 mph in the evening becoming south after midnight. * Winds...10000 FT MSL............North 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .THURSDAY... * Sky/weather.....................Sunny. * Max Temperature.................94-99. * 24 hr trend..................Little change. * Min Humidity....................6-11 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..South 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...............0 percent. * Mixing Height for Yuma..........11600 ft AGL. * Transport Wind for Yuma.........South 6 knots. * Dispersion for Yuma.............Good. .EXTENDED... .FRIDAY...Clear. Lows 62-67. Highs 94-99. South winds 10 to 20 mph. Minimum relative humidity may be lower than 15 percent. .SATURDAY...Clear. Lows 63-68. Highs 94-99. South winds 10 to 20 mph. .SUNDAY...Clear. Lows 63-69. Highs 96-101. South winds 10 to 20 mph. Minimum relative humidity may be lower than 15 percent. .MONDAY...Clear. Lows 64-69. Highs 97-102. .TUESDAY...Clear. Lows 62-68. Highs 94-99. $$ AZZ133-202030- Southern Gila County/Tonto National Forest Foothills- Southern Tonto NF/West San Carlos BIA/South Portion Ft Apache BIA/ CAZ- 118 AM MST Wed May 20 2026 .TODAY... * Sky/weather.....................Partly sunny. * Max Temperature.................76-90. * 24 hr trend..................3 degrees warmer. * Min Humidity....................9-14 pct. * 24 hr trend..................4 pct drier. * 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. .TONIGHT... * Sky/weather.....................Clear. * Min Temperature.................48-62. * 24 hr trend..................Little change. * Max Humidity....................20-30 pct. * 24 hr trend..................5 pct drier. * Winds - 20 foot...Slope/Valley..West 5 to 10 mph in the evening becoming east after midnight. * 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. .THURSDAY... * Sky/weather.....................Sunny. * Max Temperature.................77-91. * 24 hr trend..................Little change. * Min Humidity....................7-11 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Southwest 5 to 15 mph. * Winds...10000 FT MSL............Southwest 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .EXTENDED... .FRIDAY...Mostly clear. Lows 48-66. Highs 78-93. West winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .SATURDAY...Clear. Lows 50-67. Highs 80-94. West winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .SUNDAY...Clear. Lows 51-69. Highs 84-98. West winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .MONDAY...Mostly clear with slight chance of thunderstorms. Lows 52-69. Highs 83-97. .TUESDAY...Mostly clear. Lows 50-67. Highs 80-94. $$ CAZ232-202030- Imperial County And Eastern Riverside County- 118 AM PDT Wed May 20 2026 .TODAY... * Sky/weather.....................Sunny. * Max Temperature.................87-96. * 24 hr trend..................6 degrees warmer. * Min Humidity....................4-8 pct. * 24 hr trend..................Little change. * Winds - 20 foot...Slope/Valley..Northwest 5 to 15 mph. * Winds...10000 FT MSL............North 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...............0 percent. .TONIGHT... * Sky/weather.....................Clear. * Min Temperature.................62-70. * 24 hr trend..................Little change. * Max Humidity....................13-36 pct. * 24 hr trend..................5 pct wetter. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph. * Winds...10000 FT MSL............North 5 to 15 mph in the evening becoming light and variable after midnight. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .THURSDAY... * Sky/weather.....................Sunny. * Max Temperature.................90-99. * 24 hr trend..................Little change. * Min Humidity....................5-9 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Southeast 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...............0 percent. .EXTENDED... .FRIDAY...Clear. Lows 63-71. Highs 90-99. South winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .SATURDAY...Clear. Lows 64-71. Highs 89-99. South winds 10 to 20 mph. .SUNDAY...Clear. Lows 65-72. Highs 91-100. South winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .MONDAY...Clear. Lows 64-72. Highs 92-101. .TUESDAY...Clear. Lows 61-71. Highs 89-98. $$ CAZ230-202030- Joshua Tree National Park- 118 AM PDT Wed May 20 2026 .TODAY... * Sky/weather.....................Sunny. * Max Temperature.................77-90. * 24 hr trend..................6 degrees warmer. * Min Humidity....................4-8 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..North 5 to 15 mph. * Winds...10000 FT MSL............North 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...............0 percent. .TONIGHT... * Sky/weather.....................Clear. * Min Temperature.................55-65. * 24 hr trend..................4 degrees warmer. * Max Humidity....................15-20 pct. * 24 hr trend..................4 pct wetter. * Winds - 20 foot...Slope/Valley..Northwest 5 to 15 mph. * Winds...10000 FT MSL............North 5 to 15 mph in the evening becoming light and variable after midnight. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .THURSDAY... * Sky/weather.....................Sunny. * Max Temperature.................81-93. * 24 hr trend..................4 degrees warmer. * Min Humidity....................6-10 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Northwest 5 to 10 mph in the morning becoming south in the afternoon. * Winds...10000 FT MSL............Light and variable. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .EXTENDED... .FRIDAY...Clear. Lows 56-68. Highs 81-94. Southwest winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .SATURDAY...Clear. Lows 56-68. Highs 80-93. South winds 10 to 20 mph. .SUNDAY...Clear. Lows 57-68. Highs 82-95. Southwest winds 10 to 20 mph. Minimum relative humidity may be lower than 15 percent. .MONDAY...Clear. Lows 55-68. Highs 82-95. .TUESDAY...Clear. Lows 51-68. Highs 80-93. $$ .8 TO 10 DAY OUTLOOK...Wednesday May 28th through Friday May 30th: Near normal temperatures and near median precipitation.