Extreme Heat Warning
URGENT - WEATHER MESSAGE
National Weather Service Phoenix AZ
1245 AM MST Sat Aug 22 2026
AZZ530>533-535-536-CAZ562-565>567-569-570-222200-
/O.CON.KPSR.XH.W.0008.000000T0000Z-260829T0300Z/
Parker Valley-Kofa-Yuma-Central La Paz-Southeast Yuma County-Gila
River Valley-Imperial County Southwest-Imperial County Southeast-
Imperial County West-Imperial Valley-Palo Verde Valley-Chuckwalla
Valley-
Including the cities of Winona, El Centro, Winterhaven, Harcuvar,
Mountain Spring, Alamorio, Salome, Palo Verde, Brenda, Yuma, Palm
Canyon, Ripley, Vicksburg, Plaster City, Ligurta, Calexico, Coyote
Wells, Ehrenberg, Fortuna Foothills, Blythe, Brawley, Parker,
Ocotillo, Quartzsite, Martinez Lake, Vicksburg Junction, Salton City,
Midland, and Coolidge Springs
1245 AM MST Sat Aug 22 2026 /1245 AM PDT Sat Aug 22 2026/
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST /8 PM PDT/
FRIDAY...
* WHAT...Dangerously hot conditions. It will also be humid through
the weekend. Afternoon temperatures 106 to 117 expected. Major to
Extreme Heat Risk.
* WHERE...Portions of southwest Arizona and southeast California.
* WHEN...Until 8 PM MST /8 PM PDT/ Friday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Overexposure can cause heat cramps and heat
exhaustion to develop and, without intervention, can lead to heat
stroke.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
An Extreme Heat Warning means that a period of very hot temperatures,
even by local standards, will occur. Actions should be taken to
lessen the impact of the extreme heat.
Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose-fitting clothing when possible and
drink plenty of water.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.
Public cooling shelters are available in some areas. Consult county
officials for more details.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Phoenix AZ
1245 AM MST Sat Aug 22 2026
AZZ534-538-539-541-545-547-549-552>555-559-222200-
/O.CON.KPSR.XH.W.0008.000000T0000Z-260829T0300Z/
Aguila Valley-Tonopah Desert-Gila Bend-Cave Creek/New River-New
River Mesa-Rio Verde/Salt River-Fountain Hills/East Mesa-Superior-
Northwest Pinal County-West Pinal County-Apache Junction/Gold
Canyon-Sonoran Desert Natl Monument-
Including the cities of Arlington, Tonopah, Sentinel, Wintersburg,
Fountain Hills, Gladden, Cactus Forest, Florence, Kaka, Scottsdale,
Superior, Tortilla Flat, Apache Junction, Gila Bend, Aguila, Casa
Grande, Hassayampa, Wickenburg, and Coolidge
1245 AM MST Sat Aug 22 2026
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST FRIDAY...
* WHAT...Dangerously hot conditions. Afternoon temperatures 104 to
116 expected. Major to Extreme Heat Risk.
* WHERE...Aguila Valley, Apache Junction/Gold Canyon, Cave Creek/New
River, Fountain Hills/East Mesa, Gila Bend, Northwest Pinal County,
Sonoran Desert Natl Monument, Tonopah Desert, New River Mesa, Rio
Verde/Salt River, and Superior.
* WHEN...Until 8 PM MST Friday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Overexposure can cause heat cramps and heat
exhaustion to develop and, without intervention, can lead to heat
stroke.
* ADDITIONAL DETAILS...In Maricopa County, call 2-1-1 to find a free
cooling center, transportation, water and more.
https://www.maricopa.gov/heat
PRECAUTIONARY/PREPAREDNESS ACTIONS...
An Extreme Heat Warning means that a period of very hot temperatures,
even by local standards, will occur. Actions should be taken to
lessen the impact of the extreme heat.
Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose-fitting clothing when possible and
drink plenty of water.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.
Public cooling shelters are available in some areas. Consult county
officials for more details.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Phoenix AZ
1245 AM MST Sat Aug 22 2026
AZZ537-540-542>544-546-548-550-551-222200-
/O.CON.KPSR.XH.W.0008.000000T0000Z-260829T0300Z/
Northwest Valley-Buckeye/Avondale-Deer Valley-Central Phoenix-
North Phoenix/Glendale-Scottsdale/Paradise Valley-East Valley-
South Mountain/Ahwatukee-Southeast Valley/Queen Creek-
Including the cities of Gilbert, Sun Lakes, Wittmann, Liberty,
Beardsley, Surprise, Paradise Valley, Circle City, Phoenix, Mesa, Sun
City West, Cashion, Goodyear, Chandler, Queen Creek, Peoria, Tempe,
and Avondale
1245 AM MST Sat Aug 22 2026
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST FRIDAY...
* WHAT...Dangerously hot conditions. Afternoon temperatures 108 to
114 expected. Major to Extreme Heat Risk.
* WHERE...The Phoenix metropolitan area.
* WHEN...Until 8 PM MST Friday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Overexposure can cause heat cramps and heat
exhaustion to develop and, without intervention, can lead to heat
stroke.
* ADDITIONAL DETAILS...In Maricopa County, call 2-1-1 to find a free
cooling center, transportation, water and more.
https://www.maricopa.gov/heat
PRECAUTIONARY/PREPAREDNESS ACTIONS...
An Extreme Heat Warning means that a period of very hot temperatures,
even by local standards, will occur. Actions should be taken to
lessen the impact of the extreme heat.
Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose-fitting clothing when possible and
drink plenty of water.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.
Public cooling shelters are available in some areas. Consult county
officials for more details.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Phoenix AZ
1245 AM MST Sat Aug 22 2026
AZZ560-222200-
/O.CON.KPSR.XH.W.0008.000000T0000Z-260829T0300Z/
San Carlos-
Including the cities of San Carlos and Peridot
1245 AM MST Sat Aug 22 2026
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST FRIDAY...
* WHAT...Dangerously hot conditions. Afternoon temperatures 103 to
113 expected. Major to Extreme Heat Risk.
* WHERE...San Carlos.
* WHEN...Until 8 PM MST Friday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Overexposure can cause heat cramps and heat
exhaustion to develop and, without intervention, can lead to heat
stroke.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
An Extreme Heat Warning means that a period of very hot temperatures,
even by local standards, will occur. Actions should be taken to
lessen the impact of the extreme heat.
Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose-fitting clothing when possible and
drink plenty of water.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.
Public cooling shelters are available in some areas. Consult county
officials for more details.
&&
$$
KB
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
935 PM PDT Fri Aug 21 2026
CAZ061-062-065-221330-
/O.CON.KSGX.XH.W.0008.000000T0000Z-260829T0300Z/
Coachella Valley-San Diego County Deserts-San Gorgonio Pass near
Banning-
Including the cities of Palm Desert, Borrego Springs, La Quinta,
Coachella, Indio, Cathedral City, Palm Springs, and Palm Desert
Country
935 PM PDT Fri Aug 21 2026
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY AUG
28...
* WHAT...Dangerously hot conditions with temperatures up to 115.
* WHERE...Coachella Valley, San Diego County Deserts, and San
Gorgonio Pass near Banning.
* WHEN...Until 8 PM PDT Friday, August 28.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.
* ADDITIONAL DETAILS...Overnight temperatures 5 to 8 degrees above
normal will limit relief from the heat.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Las Vegas NV
731 PM PDT Fri Aug 21 2026
AZZ002-570-571-576-CAZ522-527-NVZ020-025-026-222300-
/O.CON.KVEF.XH.W.0004.000000T0000Z-260824T0300Z/
Lake Havasu and Fort Mohave-Lake Mead - AZ side-Lake Mohave - AZ
side-Northwest Deserts-Death Valley National Park-San Bernardino
County-Upper Colorado River Valley-Las Vegas Valley-Lake Mead -
NV side-Lake Mohave - NV side-
Including the cities of Furnace Creek, South Cove, Temple Bar, North
Las Vegas, Henderson, Lake Havasu City, Topock, Stovepipe Wells,
Needles, Desert Hills, Yucca, Shoshone, Valentine, Bullhead City,
Hoover Dam, Las Vegas, Laughlin, Boulder City, Golden Valley, Dolan
Springs, Kingman, and Wikieup
731 PM PDT Fri Aug 21 2026 /731 PM MST Fri Aug 21 2026/
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM PDT /8 PM MST/
SUNDAY...
* WHAT...Dangerously hot conditions with temperatures up to 115 to
118 degrees expected through Death Valley and the lower Colorado
River Valley, with highs between 107 to 110 degrees elsewhere. Near
record warm low temperatures expected in urban areas.
* WHERE...Lake Mohave, Lake Mead, Lower Colorado River Valley / Lake
Havasu, Northwest Deserts, Death Valley National Park, and Las
Vegas Valley.
* WHEN...Until 8 PM PDT /8 PM MST/ Sunday.
* IMPACTS...Heat-related illnesses increase significantly during
extreme heat events.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.
Take extra precautions when outside. Wear lightweight and
loose-fitting clothing. Try to limit strenuous activities to early
morning or evening. Take action when you see symptoms of heat
exhaustion and heat stroke.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.
Monitor the latest forecasts and warnings for updates.
&&
$$
MW
URGENT - WEATHER MESSAGE
National Weather Service Tucson AZ
108 PM MST Fri Aug 21 2026
AZZ501-502-504>506-509-221200-
/O.CON.KTWC.XH.W.0006.000000T0000Z-260823T0300Z/
Western Pima County-Tohono O`odham Nation-Tucson Metro Area-South
Central Pinal County-Southeast Pinal County-Upper Gila River
Valley-
Including the cities of Picacho Peak State Park, Ajo, Tucson, Sells,
Marana, Mammoth, Oracle, Clifton, Green Valley, Organ Pipe
Cactus N.M., Safford, and Vail
108 PM MST Fri Aug 21 2026
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST SATURDAY...
* WHAT...Dangerously hot conditions with high temperatures ranging
between 103 to 111 degrees and low temperatures 79 to 85 degrees.
Major HeatRisk is expected.
* WHERE...Pinal County, Tohono O`odham Nation, Tucson Metro Area,
Upper Gila River Valley, and Western Pima County.
* WHEN...Until 8 PM MST Saturday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.
Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when possible and
drink plenty of water.
&&
$$
EDWARDS
Heat Advisory
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
935 PM PDT Fri Aug 21 2026
CAZ048-050-056>058-554-221330-
/O.CON.KSGX.HT.Y.0010.260822T1700Z-260825T0300Z/
San Bernardino and Riverside County Valleys-The Inland Empire-San
Diego County Valleys-Riverside County Mountains-Santa Ana
Mountains and Foothills-San Diego County Mountains-Orange County
Inland Areas-
Including the cities of Ontario, El Cajon, Pine Valley, Corona,
Anaheim, Santa Ana, Mission Viejo, Rancho Cucamonga, San
Bernardino, Garden Grove, Poway, Escondido, San Marcos, Fontana,
Moreno Valley, Irvine, Riverside, Orange, Santee, La Mesa,
Fullerton, Idyllwild-Pine Cove, and Julian
935 PM PDT Fri Aug 21 2026
...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM SATURDAY TO 8 PM PDT
MONDAY...
* WHAT...Temperatures 90 to 97 for Inland Orange County, 90 to 102
for the San Diego County Valleys, 98 to 106 for the Inland Empire
and 89 to 100 in the mountains.
* WHERE...Orange County Inland Areas, Riverside County Mountains,
San Bernardino and Riverside County Valleys-The Inland Empire, San
Diego County Mountains, San Diego County Valleys, and Santa Ana
Mountains and Foothills.
* WHEN...From 10 AM Saturday to 8 PM PDT Monday.
* IMPACTS...Hot temperatures may cause heat illnesses.
* ADDITIONAL DETAILS...Low temperatures 5 to 10 degrees above normal
will limit relief from the heat. Hot weather is likely to continue
much of next week.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
935 PM PDT Fri Aug 21 2026
CAZ055-221330-
/O.CON.KSGX.HT.Y.0010.260822T1700Z-260825T0300Z/
San Bernardino County Mountains-
Including the cities of Lake Arrowhead and Crestline
935 PM PDT Fri Aug 21 2026
...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM SATURDAY TO 8 PM PDT
MONDAY FOR THE MOUNTAINS BELOW 6000 FT...
* WHAT...Temperatures 86 to 95 degrees expected.
* WHERE...San Bernardino County Mountains below 6000 ft.
* WHEN...From 10 AM Saturday to 8 PM PDT Monday.
* IMPACTS...Hot temperatures may cause heat illnesses.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
&&
$$
SS
Air Quality Alert
AZC013-240400-
Air Quality Alert
Relayed by National Weather Service Phoenix AZ
918 AM MST Fri Aug 21 2026
...OZONE HIGH POLLUTION ADVISORY FOR MARICOPA COUNTY INCLUDING THE
PHOENIX METRO AREA THROUGH SUNDAY...
The Arizona Department of Environmental Quality (ADEQ) has issued an
Ozone High Pollution Advisory for the Phoenix Metro Area through Sunday.
This means that forecast weather conditions combined with existing
ozone levels are expected to result in local maximum 8-hour ozone
concentrations that pose a health risk. Adverse health effects
increase as air quality deteriorates.
Ozone is an air contaminant which can cause breathing difficulties
for children, older adults, as well as persons with respiratory
problems. A decrease in physical activity is recommended.
You are urged to car pool, telecommute or use mass transit.
The use of gasoline-powered equipment should be reduced or done late
in the day.
For details on this High Pollution Advisory, visit the ADEQ internet
site at www.azdeq.gov/forecast/phoenix or call 602-771-2300.
$$
