046
FNUS55 KPSR 210827
FWFPSR
FIRE WEATHER PLANNING FORECAST FOR SOUTHWEST AND SOUTH-CENTRAL
ARIZONA AND SOUTHEAST CALIFORNIA
NATIONAL WEATHER SERVICE PHOENIX AZ
127 AM MST MON SEP 21 2026
DISCUSSION
TEMPERATURES WILL REMAIN NEAR THE SEASONAL NORMAL WITH DRY
CONDITIONS GIVING WAY TO A CHANCE OF THUNDERSTORMS OVER FAR
EASTERN DISTRICTS STARTING TUESDAY. MINIMUM HUMIDITY VALUES WILL
FALL INTO A 15-30% RANGE FOLLOWING FAIR TO GOOD OVERNIGHT RECOVERY
OF 30-70%. OUTSIDE OF SOME OCCASIONAL LOCALIZED BREEZINESS DUE TO
AN APPROACHING SYSTEM, WINDS SHOULD RETAIN A TYPICAL
UPSLOPE/DRAINAGE PATTERN OVER THE NEXT FEW DAYS
..THUNDERSTORMS IMPLY GUSTY WINDS
NOTE...ADDITIONAL FIRE WEATHER FORECAST INFORMATION CAN BE FOUND
IN THE AREA FORECAST DISCUSSION. SEE PRODUCT PHXAFDPSR.
AZZ132-212030-
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-
127 AM MST MON SEP 21 2026
TODAY
* SKY/WEATHER.....................PARTLY SUNNY.
* MAX TEMPERATURE.................93-101.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................18-23 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 20 TO 30 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............1 PERCENT.
* MIXING HEIGHT FOR PHOENIX.......12200 FT AGL.
* TRANSPORT WIND FOR PHOENIX......SOUTH 10 KNOTS.
* DISPERSION FOR PHOENIX..........EXCELLENT.
TONIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................70-80.
* 24 HR TREND..................4 DEGREES COOLER.
* MAX HUMIDITY....................37-53 PCT.
* 24 HR TREND..................6 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 20 TO 30 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............1 PERCENT.
TUESDAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................92-99.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................17-23 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 5 TO 10 MPH IN THE
MORNING BECOMING SOUTH IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTH 20 TO 30 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
* MIXING HEIGHT FOR PHOENIX.......10400 FT AGL.
* TRANSPORT WIND FOR PHOENIX......SOUTHEAST 8 KNOTS.
* DISPERSION FOR PHOENIX..........VERY GOOD.
EXTENDED
WEDNESDAY
MOSTLY CLEAR. LOWS 72-82. HIGHS 92-100. EAST WINDS
5 TO 15 MPH.
THURSDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 72-82. HIGHS 92-100. EAST WINDS 5 TO 15 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 72-82. HIGHS 94-102. EAST WINDS 5 TO
15 MPH.
SATURDAY
MOSTLY CLEAR. LOWS 75-85. HIGHS 97-104.
SUNDAY
PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 73-83. HIGHS 93-100.
AZZ131-CAZ231-212030-
YUMA/MARTINEZ LAKE AND VICINITY/LOWER COLORADO RIVER VALLEY AZ-
LOWER COLORADO RIVER VALLEY CA-
127 AM MST MON SEP 21 2026 /127 AM PDT MON SEP 21 2026/
TODAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................96-101.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................17-21 PCT.
* 24 HR TREND..................LITTLE CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 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.
* MIXING HEIGHT FOR YUMA..........9100 FT AGL.
* TRANSPORT WIND FOR YUMA.........SOUTHWEST 8 KNOTS.
* DISPERSION FOR YUMA.............VERY GOOD.
TONIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................68-73.
* 24 HR TREND..................6 DEGREES COOLER.
* MAX HUMIDITY....................46-57 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 20 TO 30 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
TUESDAY
* SKY/WEATHER.....................SUNNY.
* MAX TEMPERATURE.................95-100.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................13-18 PCT.
* 24 HR TREND..................4 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 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...............0 PERCENT.
* MIXING HEIGHT FOR YUMA..........8500 FT AGL.
* TRANSPORT WIND FOR YUMA.........SOUTH 3 KNOTS.
* DISPERSION FOR YUMA.............POOR.
EXTENDED
WEDNESDAY
MOSTLY CLEAR. LOWS 70-79. HIGHS 98-103. SOUTHEAST
WINDS 5 TO 10 MPH.
THURSDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 74-80. HIGHS 98-103. SOUTHEAST WINDS 5 TO
10 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 74-80. HIGHS 100-105. SOUTHEAST
WINDS 5 TO 10 MPH.
SATURDAY
MOSTLY CLEAR. LOWS 76-81. HIGHS 102-107.
SUNDAY
MOSTLY CLEAR. LOWS 73-81. HIGHS 97-102.
AZZ133-212030-
SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS-
SOUTHERN TONTO NF/WEST SAN CARLOS BIA/SOUTH PORTION FT APACHE BIA/
CAZ-
127 AM MST MON SEP 21 2026
TODAY
* SKY/WEATHER.....................PARTLY SUNNY.
* MAX TEMPERATURE.................81-96.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................21-30 PCT.
* 24 HR TREND..................3 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 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...............2 PERCENT.
TONIGHT
* SKY/WEATHER.....................PARTLY CLOUDY.
* MIN TEMPERATURE.................59-74.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................43-65 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 15 TO 25 MPH.
* CHANCE OF PRECIP................10 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............4 PERCENT.
TUESDAY
* SKY/WEATHER.....................PARTLY SUNNY. SLIGHT CHANCE OF
SHOWERS . SLIGHT CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.................78-94.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................24-39 PCT.
* 24 HR TREND..................6 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 15 TO 25 MPH.
* CHANCE OF PRECIP................20 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............17 PERCENT.
EXTENDED
WEDNESDAY
PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 57-74. HIGHS 75-92. EAST WINDS 10 TO 20 MPH.
THURSDAY
PARTLY CLOUDY WITH CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 57-73. HIGHS 76-92. EAST WINDS 10 TO 20 MPH.
FRIDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 57-74. HIGHS 77-93. EAST WINDS 10 TO 20 MPH.
SATURDAY
MOSTLY CLEAR. LOWS 58-75. HIGHS 81-97.
SUNDAY
PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 59-75. HIGHS 77-93.
CAZ232-212030-
IMPERIAL COUNTY AND EASTERN RIVERSIDE COUNTY-
127 AM PDT MON SEP 21 2026
TODAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................90-100.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................11-20 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 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...............0 PERCENT.
TONIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................67-73.
* 24 HR TREND..................6 DEGREES COOLER.
* MAX HUMIDITY....................40-60 PCT.
* 24 HR TREND..................3 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 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...............0 PERCENT.
TUESDAY
* SKY/WEATHER.....................SUNNY.
* MAX TEMPERATURE.................89-98.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................11-20 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 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.
EXTENDED
WEDNESDAY
CLEAR. LOWS 70-80. HIGHS 92-102. NORTHEAST WINDS
5 TO 15 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 74-81. HIGHS 93-102. SOUTHEAST
WINDS 5 TO 10 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 74-81. HIGHS 94-104. SOUTHEAST WINDS
5 TO 10 MPH.
SATURDAY
MOSTLY CLEAR. LOWS 74-81. HIGHS 95-106.
SUNDAY
MOSTLY CLEAR. LOWS 71-80. HIGHS 92-102.
CAZ230-212030-
JOSHUA TREE NATIONAL PARK-
127 AM PDT MON SEP 21 2026
TODAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................77-93.
* 24 HR TREND..................3 DEGREES COOLER.
* MIN HUMIDITY....................16-24 PCT.
* 24 HR TREND..................7 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...............2 PERCENT.
TONIGHT
* SKY/WEATHER.....................CLEAR.
* MIN TEMPERATURE.................59-70.
* 24 HR TREND..................5 DEGREES COOLER.
* MAX HUMIDITY....................43-53 PCT.
* 24 HR TREND..................10 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..WEST 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 10 TO 15 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
TUESDAY
* SKY/WEATHER.....................SUNNY.
* MAX TEMPERATURE.................77-90.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................18-23 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTH 5 TO 15 MPH.
* WINDS...10000 FT MSL............SOUTH 5 TO 15 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
EXTENDED
WEDNESDAY
CLEAR. LOWS 63-75. HIGHS 81-94. NORTH WINDS 5 TO
15 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 65-75. HIGHS 81-95. SOUTHWEST
WINDS 5 TO 15 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 65-76. HIGHS 82-96. SOUTHWEST WINDS
5 TO 15 MPH.
SATURDAY
MOSTLY CLEAR. LOWS 63-76. HIGHS 85-97.
SUNDAY
MOSTLY CLEAR. LOWS 61-74. HIGHS 80-94.
8 TO 10 DAY OUTLOOK
MONDAY SEPTEMBER 28TH THROUGH WEDNESDAY
SEPTEMBER 30TH: ABOVE NORMAL TEMPERATURES AND ABOVE MEDIAN
PRECIPITATION.
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