Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Phoenix, AZ
Issued by NWS Phoenix, AZ
019 FNUS55 KPSR 171933 FWFPSR Fire Weather Planning Forecast for Southwest and South-Central Arizona and Southeast California National Weather Service Phoenix AZ 1233 PM MST Thu Sep 17 2026 .DISCUSSION... Lingering wet grounds and elevated surface moisture will continue into Friday, but a drying trend will begin today, initially aloft, followed by a more significant drying this weekend. Minimum RH values this afternoon will be around 25-45%, with driest conditions in southeast CA. As drying continues into Friday, MinRHs will dip to 10-20% across southeast CA and southwest AZ and 25-35% across south-central AZ. Overnight recoveries will be highest tonight at 50-80%, then drop to 30-70% (driest out near the Lower Colorado River) Friday night. By this weekend, much of the lower deserts will see afternoon MinRHs dip into the teens. Winds will mostly follow typical diurnal patterns with modest afternoon upslope/upvalley gustiness (15-25 mph). ...Thunderstorms imply gusty winds... Note...Additional Fire Weather Forecast information can be found in the Area Forecast Discussion. See product PHXAFDPSR. AZZ132-180745- 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- 1233 PM MST Thu Sep 17 2026 .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................71-81. * 24 hr trend..................Little change. * Max Humidity....................55-74 pct. * 24 hr trend..................13 pct drier. * Winds - 20 foot...Slope/Valley..Southeast 5 to 15 mph. * Winds...10000 FT MSL............South 15 to 25 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............1 percent. .FRIDAY... * Sky/weather.....................Sunny. * Max Temperature.................94-101. * 24 hr trend..................4 degrees warmer. * Min Humidity....................17-28 pct. * 24 hr trend..................13 pct drier. * Winds - 20 foot...Slope/Valley..Southeast 5 to 10 mph in the morning becoming southwest in the afternoon. * 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. * Mixing Height for Phoenix.......10000 ft AGL. * Transport Wind for Phoenix......South 6 knots. * Dispersion for Phoenix..........Good. .FRIDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................70-80. * 24 hr trend..................Little change. * Max Humidity....................25-62 pct. * 24 hr trend..................19 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 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .SATURDAY... * Sky/weather.....................Sunny. * Max Temperature.................95-102. * 24 hr trend..................Little change. * Min Humidity....................12-22 pct. * 24 hr trend..................6 pct drier. * Winds - 20 foot...Slope/Valley..East 5 to 10 mph in the morning becoming southwest in the afternoon. * 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. * Mixing Height for Phoenix.......10500 ft AGL. * Transport Wind for Phoenix......Southwest 7 knots. * Dispersion for Phoenix..........Very good. .EXTENDED... .SUNDAY...Mostly clear. Lows 71-81. Highs 95-103. Southeast winds 5 to 10 mph. .MONDAY...Partly cloudy. Lows 71-81. Highs 94-101. South winds 5 to 15 mph. .TUESDAY...Mostly clear. Lows 71-81. Highs 94-101. Southeast winds 5 to 10 mph. .WEDNESDAY...Mostly clear. Lows 72-82. Highs 96-103. .THURSDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 74-84. Highs 97-104. $$ AZZ131-CAZ231-180745- Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ- Lower Colorado River Valley CA- 1233 PM MST Thu Sep 17 2026 /1233 PM PDT Thu Sep 17 2026/ .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................73-78. * 24 hr trend..................Little change. * Max Humidity....................52-66 pct. * 24 hr trend..................15 pct drier. * 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. .FRIDAY... * Sky/weather.....................Sunny. * Max Temperature.................98-103. * 24 hr trend..................Little change. * Min Humidity....................10-17 pct. * 24 hr trend..................16 pct drier. * Winds - 20 foot...Slope/Valley..West 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. * Mixing Height for Yuma..........7500 ft AGL. * Transport Wind for Yuma.........Southwest 6 knots. * Dispersion for Yuma.............Good. .FRIDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................69-74. * 24 hr trend..................3 degrees cooler. * Max Humidity....................26-37 pct. * 24 hr trend..................28 pct drier. * Winds - 20 foot...Slope/Valley..West 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. .SATURDAY... * Sky/weather.....................Sunny. * Max Temperature.................99-104. * 24 hr trend..................Little change. * Min Humidity....................9-13 pct. * 24 hr trend..................3 pct drier. * Winds - 20 foot...Slope/Valley..Northwest 5 to 10 mph in the morning becoming west 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. * Mixing Height for Yuma..........8700 ft AGL. * Transport Wind for Yuma.........Southwest 5 knots. * Dispersion for Yuma.............Good. .EXTENDED... .SUNDAY...Mostly clear. Lows 71-77. Highs 99-104. South winds 5 to 15 mph. .MONDAY...Mostly clear. Lows 70-77. Highs 97-102. South winds 5 to 15 mph. .TUESDAY...Clear. Lows 70-76. Highs 97-102. Southeast winds 5 to 10 mph. .WEDNESDAY...Mostly clear. Lows 72-78. Highs 99-104. .THURSDAY...Mostly clear. Lows 74-81. Highs 100-105. $$ AZZ133-180745- Southern Gila County/Tonto National Forest Foothills- Southern Tonto NF/West San Carlos BIA/South Portion Ft Apache BIA/ CAZ- 1233 PM MST Thu Sep 17 2026 .TONIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................59-73. * 24 hr trend..................Little change. * Max Humidity....................68-87 pct. * 24 hr trend..................13 pct drier. * Winds - 20 foot...Slope/Valley..Light and variable in the evening becoming east 5 to 10 mph after midnight. * Winds...10000 FT MSL............South 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............4 percent. .FRIDAY... * Sky/weather.....................Sunny. * Max Temperature.................80-95. * 24 hr trend..................5 degrees warmer. * Min Humidity....................28-44 pct. * 24 hr trend..................12 pct drier. * Winds - 20 foot...Slope/Valley..East 5 to 10 mph in the morning becoming south 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...............2 percent. .FRIDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................58-73. * 24 hr trend..................Little change. * Max Humidity....................59-81 pct. * 24 hr trend..................8 pct drier. * Winds - 20 foot...Slope/Valley..Northwest 5 to 10 mph in the evening becoming northeast after midnight. * Winds...10000 FT MSL............South 15 to 25 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............0 percent. .SATURDAY... * Sky/weather.....................Sunny. * Max Temperature.................81-96. * 24 hr trend..................Little change. * Min Humidity....................20-32 pct. * 24 hr trend..................10 pct drier. * Winds - 20 foot...Slope/Valley..East 5 to 10 mph in the morning becoming southwest in the afternoon. * Winds...10000 FT MSL............Southwest 10 to 20 mph. * Chance of Precip................0 percent. * CWR (>= 0.10 IN)................0 percent. * Chance of Thunder...............1 percent. .EXTENDED... .SUNDAY...Mostly clear. Lows 56-74. Highs 80-96. East winds 5 to 10 mph. .MONDAY...Partly cloudy. Lows 57-74. Highs 79-95. Southeast winds 5 to 10 mph. .TUESDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 57-74. Highs 79-95. East winds 5 to 15 mph. .WEDNESDAY...Mostly clear with slight chance of showers and thunderstorms. Lows 58-75. Highs 78-96. .THURSDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 58-75. Highs 78-96. $$ CAZ232-180745- Imperial County And Eastern Riverside County- 1233 PM PDT Thu Sep 17 2026 .TONIGHT... * Sky/weather.....................Clear. * Min Temperature.................72-77. * 24 hr trend..................Little change. * Max Humidity....................33-55 pct. * 24 hr trend..................21 pct drier. * Winds - 20 foot...Slope/Valley..West 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. .FRIDAY... * Sky/weather.....................Sunny. * Max Temperature.................92-102. * 24 hr trend..................Little change. * Min Humidity....................8-14 pct. * 24 hr trend..................16 pct drier. * Winds - 20 foot...Slope/Valley..West 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. .FRIDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................70-75. * 24 hr trend..................Little change. * Max Humidity....................24-41 pct. * 24 hr trend..................13 pct drier. * Winds - 20 foot...Slope/Valley..West 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. .SATURDAY... * Sky/weather.....................Sunny. * Max Temperature.................93-102. * 24 hr trend..................Little change. * Min Humidity....................8-13 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..Northwest 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... .SUNDAY...Partly cloudy. Lows 72-79. Highs 93-103. South winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .MONDAY...Mostly clear. Lows 70-78. Highs 91-101. Southwest winds 5 to 15 mph. .TUESDAY...Clear. Lows 70-79. Highs 92-102. Northwest winds 5 to 15 mph. .WEDNESDAY...Clear. Lows 72-80. Highs 94-104. .THURSDAY...Mostly clear. Lows 73-82. Highs 95-104. $$ CAZ230-180745- Joshua Tree National Park- 1233 PM PDT Thu Sep 17 2026 .TONIGHT... * Sky/weather.....................Clear. * Min Temperature.................63-72. * 24 hr trend..................Little change. * Max Humidity....................38-47 pct. * 24 hr trend..................33 pct drier. * Winds - 20 foot...Slope/Valley..Southwest 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. .FRIDAY... * Sky/weather.....................Sunny. * Max Temperature.................80-94. * 24 hr trend..................Little change. * Min Humidity....................13-17 pct. * 24 hr trend..................15 pct drier. * Winds - 20 foot...Slope/Valley..Northwest 5 to 10 mph in the morning becoming southwest 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...............0 percent. .FRIDAY NIGHT... * Sky/weather.....................Mostly clear. * Min Temperature.................63-71. * 24 hr trend..................Little change. * Max Humidity....................30-35 pct. * 24 hr trend..................10 pct drier. * Winds - 20 foot...Slope/Valley..Northwest 5 to 15 mph. * Winds...10000 FT MSL............Southwest 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. .SATURDAY... * Sky/weather.....................Sunny. * Max Temperature.................82-95. * 24 hr trend..................Little change. * Min Humidity....................11-15 pct. * 24 hr trend..................Little RH change. * Winds - 20 foot...Slope/Valley..North 5 to 15 mph. * 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. .EXTENDED... .SUNDAY...Partly cloudy. Lows 65-75. Highs 82-96. Southwest winds 5 to 15 mph. Minimum relative humidity may be lower than 15 percent. .MONDAY...Mostly clear. Lows 62-75. Highs 79-93. Southwest winds 5 to 15 mph. .TUESDAY...Clear. Lows 62-73. Highs 80-94. North winds 5 to 15 mph. .WEDNESDAY...Clear. Lows 65-74. Highs 82-96. .THURSDAY...Mostly clear. Lows 66-75. Highs 82-96. $$ .8 TO 10 DAY OUTLOOK...Friday September 25th through Sunday September 27th: Above normal temperatures and near to above median precipitation.