819
FNUS55 KPSR 220807
FWFPSR
FIRE WEATHER PLANNING FORECAST FOR SOUTHWEST AND SOUTH-CENTRAL
ARIZONA AND SOUTHEAST CALIFORNIA
NATIONAL WEATHER SERVICE PHOENIX AZ
107 AM MST SAT AUG 22 2026
DISCUSSION
ABOVE NORMAL TEMPERATURES CONTINUE INTO NEXT WEEK. MINRH VALUES
WILL BE AROUND 12-20% TODAY AND INCREASE TO AROUND 15-25%
TOMORROW WITH OVERNIGHT RECOVERY OF 30-60%. SCATTERED
THUNDERSTORMS ARE EXPECTED ACROSS THE HIGHER TERRAIN AREAS THIS
WEEKEND WITH ONLY SLIGHT CHANCES FOR ISOLATED SHOWERS AND STORMS
ACROSS THE SOUTH- CENTRAL AZ LOWER DESERTS. 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.
AZZ132-222015-
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-
107 AM MST SAT AUG 22 2026
TODAY
* 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..SOUTHEAST 5 TO 10 MPH IN THE
MORNING BECOMING WEST IN THE AFTERNOON.
* WINDS...10000 FT MSL............SOUTH 5 TO 15 MPH IN THE MORNING
BECOMING LIGHT AND VARIABLE IN THE AFTERNOON.
* CHANCE OF PRECIP................10 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............2 PERCENT.
* MIXING HEIGHT FOR PHOENIX.......14700 FT AGL.
* TRANSPORT WIND FOR PHOENIX......WEST 6 KNOTS.
* DISPERSION FOR PHOENIX..........GOOD.
TONIGHT
* SKY/WEATHER.....................PARTLY CLOUDY. SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS IN THE EVENING.
* MIN TEMPERATURE.................83-93.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................28-41 PCT.
* 24 HR TREND..................LITTLE CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTH 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................10 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............3 PERCENT.
SUNDAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................105-111.
* 24 HR TREND..................3 DEGREES COOLER.
* MIN HUMIDITY....................16-22 PCT.
* 24 HR TREND..................5 PCT WETTER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 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................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
* MIXING HEIGHT FOR PHOENIX.......14100 FT AGL.
* TRANSPORT WIND FOR PHOENIX......WEST 6 KNOTS.
* DISPERSION FOR PHOENIX..........VERY GOOD.
EXTENDED
MONDAY
PARTLY CLOUDY. LOWS 81-91. HIGHS 103-109. SOUTHWEST
WINDS 5 TO 15 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 82-92. HIGHS 106-113. WEST WINDS
5 TO 15 MPH.
WEDNESDAY
MOSTLY CLEAR. LOWS 83-93. HIGHS 108-114. SOUTHWEST
WINDS 5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
THURSDAY
MOSTLY CLEAR. LOWS 83-93. HIGHS 108-114.
FRIDAY
MOSTLY CLEAR. LOWS 84-94. HIGHS 108-114.
AZZ131-CAZ231-222015-
YUMA/MARTINEZ LAKE AND VICINITY/LOWER COLORADO RIVER VALLEY AZ-
LOWER COLORADO RIVER VALLEY CA-
107 AM MST SAT AUG 22 2026 /107 AM PDT SAT AUG 22 2026/
TODAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................111-116.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................11-15 PCT.
* 24 HR TREND..................3 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...............0 PERCENT.
* MIXING HEIGHT FOR YUMA..........16200 FT AGL.
* TRANSPORT WIND FOR YUMA.........SOUTHWEST 7 KNOTS.
* DISPERSION FOR YUMA.............VERY GOOD.
TONIGHT
* SKY/WEATHER.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................84-89.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................29-41 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* 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.
SUNDAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................109-114.
* 24 HR TREND..................3 DEGREES COOLER.
* MIN HUMIDITY....................15-22 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................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
* MIXING HEIGHT FOR YUMA..........9600 FT AGL.
* TRANSPORT WIND FOR YUMA.........SOUTH 10 KNOTS.
* DISPERSION FOR YUMA.............VERY GOOD.
EXTENDED
MONDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 82-87. HIGHS 105-110. SOUTH WINDS 5 TO
15 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 83-89. HIGHS 108-113. SOUTHWEST
WINDS 5 TO 10 MPH.
WEDNESDAY
MOSTLY CLEAR. LOWS 84-89. HIGHS 110-115. SOUTHWEST
WINDS 5 TO 15 MPH. MINIMUM RELATIVE HUMIDITY MAY BE LOWER THAN
15 PERCENT.
THURSDAY
MOSTLY CLEAR. LOWS 84-89. HIGHS 110-115.
FRIDAY
MOSTLY CLEAR. LOWS 84-89. HIGHS 110-115.
AZZ133-222015-
SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS-
SOUTHERN TONTO NF/WEST SAN CARLOS BIA/SOUTH PORTION FT APACHE BIA/
CAZ-
107 AM MST SAT AUG 22 2026
TODAY
* SKY/WEATHER.....................PARTLY SUNNY. CHANCE OF SHOWERS
AND SLIGHT CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.................93-109.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................13-21 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..EAST 5 TO 10 MPH IN THE MORNING
BECOMING SOUTHWEST 5 TO 15 MPH 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................20 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............18 PERCENT.
TONIGHT
* SKY/WEATHER.....................PARTLY CLOUDY. SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS IN THE EVENING.
* MIN TEMPERATURE.................66-84.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................37-56 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................20 PERCENT IN THE EVENING
BECOMING 10 PERCENT AFTER MIDNIGHT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............11 PERCENT.
SUNDAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................92-107.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................15-23 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHEAST 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 SOUTHWEST IN THE AFTERNOON.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
EXTENDED
MONDAY
PARTLY CLOUDY. LOWS 66-83. HIGHS 91-106. NORTHWEST
WINDS 5 TO 15 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 66-84. HIGHS 93-108. NORTHWEST
WINDS 5 TO 15 MPH.
WEDNESDAY
MOSTLY CLEAR. LOWS 67-84. HIGHS 94-110. NORTH WINDS
5 TO 15 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 67-85. HIGHS 95-110.
FRIDAY
MOSTLY CLEAR. LOWS 67-85. HIGHS 95-110.
CAZ232-222015-
IMPERIAL COUNTY AND EASTERN RIVERSIDE COUNTY-
107 AM PDT SAT AUG 22 2026
TODAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................105-115.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................11-17 PCT.
* 24 HR TREND..................4 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..NORTHWEST 5 TO 10 MPH IN THE
MORNING BECOMING SOUTH 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.................84-90.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................25-40 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...............0 PERCENT.
SUNDAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................104-113.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................13-20 PCT.
* 24 HR TREND..................LITTLE RH CHANGE.
* 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.
EXTENDED
MONDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 82-89. HIGHS 101-110. SOUTH WINDS 5 TO
15 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 83-91. HIGHS 103-113. WEST WINDS
5 TO 10 MPH.
WEDNESDAY
MOSTLY CLEAR. LOWS 85-91. HIGHS 105-115. SOUTHWEST
WINDS 5 TO 15 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 84-91. HIGHS 105-114.
FRIDAY
MOSTLY CLEAR. LOWS 84-91. HIGHS 105-114.
CAZ230-222015-
JOSHUA TREE NATIONAL PARK-
107 AM PDT SAT AUG 22 2026
TODAY
* SKY/WEATHER.....................SUNNY.
* MAX TEMPERATURE.................95-109.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................13-18 PCT.
* 24 HR TREND..................5 PCT DRIER.
* WINDS - 20 FOOT...SLOPE/VALLEY..SOUTHWEST 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.....................MOSTLY CLEAR.
* MIN TEMPERATURE.................73-86.
* 24 HR TREND..................LITTLE CHANGE.
* MAX HUMIDITY....................27-34 PCT.
* 24 HR TREND..................LITTLE CHANGE.
* 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.
SUNDAY
* SKY/WEATHER.....................MOSTLY SUNNY.
* MAX TEMPERATURE.................94-108.
* 24 HR TREND..................LITTLE CHANGE.
* MIN HUMIDITY....................13-18 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............SOUTH 15 TO 25 MPH.
* CHANCE OF PRECIP................0 PERCENT.
* CWR (>= 0.10 IN)................0 PERCENT.
* CHANCE OF THUNDER...............0 PERCENT.
EXTENDED
MONDAY
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS 72-85. HIGHS 91-104. SOUTHWEST WINDS 5 TO
15 MPH.
TUESDAY
CLEAR. LOWS 72-87. HIGHS 93-106. WEST WINDS 5 TO
10 MPH.
WEDNESDAY
MOSTLY CLEAR. LOWS 74-87. HIGHS 95-109. WEST WINDS
5 TO 15 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 74-87. HIGHS 94-109.
FRIDAY
MOSTLY CLEAR. LOWS 74-87. HIGHS 95-109.
8 TO 10 DAY OUTLOOK
SATURDAY AUGUST 29TH THROUGH MONDAY AUGUST
31ST: ABOVE NORMAL TEMPERATURES AND NEAR MEDIAN PRECIPITATION.
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