FNUS55 KPSR 182110 FWFPSR Fire Weather Planning Forecast for Southwest and South-Central Arizona and Southeast California National Weather Service Phoenix AZ 210 PM MST Mon May 18 2026 .DISCUSSION... Seasonal temperatures with dry conditions will persist through the remainder of this week. Daily afternoon humidity values will bottom out around 5-15% each day with poor to fair overnight recoveries up to 25-50%. Seasonal wind patterns are expected each day, with typical afternoon upslope breezes around 15-25 mph. The only exception being another brief enhanced northerly wind down the Lower Colorado River Valley on Tuesday morning. There is no rain forecasted for the next several days. Note...Additional Fire Weather Forecast information can be found in the Area Forecast Discussion. See product PHXAFDPSR. AZZ132-190915- 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- 210 PM MST Mon May 18 2026 .TONIGHT... * Sky/weather.....................Clear. * Min Temperature.................55-65. * 24 hr trend..................3 degrees cooler. * Max Humidity....................18-48 pct. * 24 hr trend..................21 pct drier. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph. * Winds...10000 FT MSL............West 15 to 25 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................85-92. * 24 hr trend..................4 degrees warmer. * Min Humidity....................7-12 pct. * 24 hr trend..................4 pct drier. * Winds - 20 foot...Slope/Valley..West 5 to 15 mph. * Winds...10000 FT MSL............West 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. * Mixing Height for Phoenix.......10000 ft AGL. * Transport Wind for Phoenix......Southwest 9 knots. * Dispersion for Phoenix..........Very good. .TUESDAY NIGHT... * Sky/weather.....................Partly cloudy. * Min Temperature.................57-67. * 24 hr trend..................3 degrees warmer. * Max Humidity....................17-38 pct. * 24 hr trend..................5 pct drier. * Winds - 20 foot...Slope/Valley..West 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. .WEDNESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................88-94. * 24 hr trend..................3 degrees warmer. * Min Humidity....................7-11 pct. * 24 hr trend..................Little change. * Winds - 20 foot...Slope/Valley..Southwest 5 to 15 mph. * Winds...10000 FT MSL............Southwest 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 Phoenix.......12900 ft AGL. * Transport Wind for Phoenix......Southwest 7 knots. * Dispersion for Phoenix..........Very good. .EXTENDED... .THURSDAY...Mostly clear. Lows 59-69. Highs 90-97. South winds 5 to 10 mph. Minimum relative humidity may be lower than 15 percent. .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 62-72. Highs 91-97. Southwest winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .SUNDAY...Clear. Lows 63-73. Highs 94-100. .MONDAY...Mostly clear. Lows 64-74. Highs 94-100. $$ AZZ131-CAZ231-190915- Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ- Lower Colorado River Valley CA- 210 PM MST Mon May 18 2026 /210 PM PDT Mon May 18 2026/ .TONIGHT... * Sky/weather.....................Clear. * Min Temperature.................55-61. * 24 hr trend..................4 degrees cooler. * Max Humidity....................19-42 pct. * 24 hr trend..................17 pct drier. * Winds - 20 foot...Slope/Valley..North 5 to 15 mph. * Winds...10000 FT MSL............Northwest 15 to 25 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................88-93. * 24 hr trend..................5 degrees warmer. * Min Humidity....................6-10 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..North 5 to 15 mph. * Winds...10000 FT MSL............Northwest 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..........11300 ft AGL. * Transport Wind for Yuma.........North 6 knots. * Dispersion for Yuma.............Good. .TUESDAY NIGHT... * Sky/weather.....................Partly cloudy. * Min Temperature.................56-63. * 24 hr trend..................Little change. * Max Humidity....................21-47 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..North 5 to 15 mph. * 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. .WEDNESDAY... * Sky/weather.....................Sunny. * Max Temperature.................92-97. * 24 hr trend..................3 degrees warmer. * Min Humidity....................5-10 pct. * 24 hr trend..................Little change. * Winds - 20 foot...Slope/Valley..North 5 to 10 mph in the morning becoming northwest 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. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. * Mixing Height for Yuma..........12500 ft AGL. * Transport Wind for Yuma.........Southwest 6 knots. * Dispersion for Yuma.............Good. .EXTENDED... .THURSDAY...Clear. Lows 59-66. Highs 93-98. South winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .FRIDAY...Clear. Lows 61-66. Highs 94-99. South winds 10 to 20 mph. .SATURDAY...Clear. Lows 62-67. Highs 93-98. South winds 10 to 20 mph. .SUNDAY...Clear. Lows 63-69. Highs 96-101. .MONDAY...Clear. Lows 64-69. Highs 96-101. $$ AZZ133-190915- Southern Gila County/Tonto National Forest Foothills- Southern Tonto NF/West San Carlos BIA/South Portion Ft Apache BIA/ CAZ- 210 PM MST Mon May 18 2026 .TONIGHT... * Sky/weather.....................Clear. * Min Temperature.................45-60. * 24 hr trend..................Little change. * Max Humidity....................35-59 pct. * 24 hr trend..................5 pct drier. * Winds - 20 foot...Slope/Valley..West 5 to 10 mph in the evening becoming mostly downslope/downvalley after midnight. * Winds...10000 FT MSL............Southwest 20 to 30 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................75-89. * 24 hr trend..................5 degrees warmer. * Min Humidity....................11-18 pct. * 24 hr trend..................7 pct drier. * Winds - 20 foot...Slope/Valley..South 5 to 15 mph. * Winds...10000 FT MSL............Southwest 15 to 25 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .TUESDAY NIGHT... * Sky/weather.....................Partly cloudy. * Min Temperature.................49-63. * 24 hr trend..................4 degrees warmer. * Max Humidity....................24-40 pct. * 24 hr trend..................15 pct drier. * Winds - 20 foot...Slope/Valley..West 5 to 10 mph in the evening becoming mostly downslope/downvalley after midnight. * Winds...10000 FT MSL............Southwest 15 to 25 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .WEDNESDAY... * Sky/weather.....................Partly sunny. * Max Temperature.................75-90. * 24 hr trend..................Little change. * Min Humidity....................9-14 pct. * 24 hr trend..................3 pct drier. * Winds - 20 foot...Slope/Valley..South 5 to 10 mph in the morning becoming southwest 5 to 15 mph in the afternoon. * 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... .THURSDAY...Mostly clear. Lows 47-64. Highs 77-92. Southwest winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .FRIDAY...Clear. Lows 48-65. Highs 78-93. Southwest winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .SATURDAY...Mostly clear. Lows 49-67. Highs 80-94. West winds 5 to 15 mph. .SUNDAY...Mostly clear. Lows 51-68. Highs 82-96. .MONDAY...Mostly clear. Lows 52-68. Highs 82-96. $$ CAZ232-190915- Imperial County And Eastern Riverside County- 210 PM PDT Mon May 18 2026 .TONIGHT... * Sky/weather.....................Clear. * Min Temperature.................58-66. * 24 hr trend..................3 degrees cooler. * Max Humidity....................12-37 pct. * 24 hr trend..................24 pct drier. * Winds - 20 foot...Slope/Valley..Northwest 5 to 15 mph. * Winds...10000 FT MSL............Northwest 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .TUESDAY... * Sky/weather.....................Mostly sunny. * Max Temperature.................84-92. * 24 hr trend..................5 degrees warmer. * Min Humidity....................4-9 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..North 5 to 15 mph. * Winds...10000 FT MSL............North 10 to 15 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .TUESDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................60-69. * 24 hr trend..................Little change. * Max Humidity....................10-37 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Northwest 5 to 15 mph. * 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. .WEDNESDAY... * Sky/weather.....................Sunny. * Max Temperature.................87-96. * 24 hr trend..................4 degrees warmer. * Min Humidity....................4-8 pct. * 24 hr trend..................Little change. * Winds - 20 foot...Slope/Valley..North 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. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .EXTENDED... .THURSDAY...Mostly clear. Lows 62-70. Highs 89-99. South winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .FRIDAY...Clear. Lows 63-70. Highs 89-98. South winds 5 to 15 mph. .SATURDAY...Clear. Lows 63-71. Highs 89-98. South winds 10 to 20 mph. .SUNDAY...Clear. Lows 65-72. Highs 91-100. .MONDAY...Clear. Lows 65-72. Highs 91-100. $$ CAZ230-190915- Joshua Tree National Park- 210 PM PDT Mon May 18 2026 .TONIGHT... * Sky/weather.....................Clear. * Min Temperature.................48-59. * 24 hr trend..................5 degrees cooler. * Max Humidity....................14-19 pct. * 24 hr trend..................30 pct drier. * Winds - 20 foot...Slope/Valley..Northwest 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. .TUESDAY... * Sky/weather.....................Sunny. * Max Temperature.................72-85. * 24 hr trend..................5 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 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. .TUESDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................52-62. * 24 hr trend..................4 degrees warmer. * Max Humidity....................12-16 pct. * 24 hr trend..................3 pct drier. * Winds - 20 foot...Slope/Valley..Northwest 5 to 15 mph. * Winds...10000 FT MSL............Light and variable in the evening becoming north 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.....................Sunny. * Max Temperature.................77-90. * 24 hr trend..................5 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............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...............0 percent. .EXTENDED... .THURSDAY...Mostly clear. Lows 55-67. Highs 80-93. Southwest winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .FRIDAY...Clear. Lows 55-67. Highs 80-93. Southwest winds 10 to 20 mph. Minimum relative humidity may be lower than 15 percent. .SATURDAY...Clear. Lows 56-67. Highs 80-92. South winds 10 to 20 mph. .SUNDAY...Clear. Lows 56-69. Highs 82-94. .MONDAY...Clear. Lows 55-69. Highs 82-95. $$ .8 TO 10 DAY OUTLOOK...Tuesday May 26th through Thursday May 28th: Above normal temperatures and near to above median precipitation.