Weather Warnings for Arizona

Issued by the National Weather Service

Current watches, warnings, and advisories for Arizona
Alerts Updated: August 17, 2026, 12:57 pm  UTC


Extreme Heat Warning issued August 17 at 2:14AM PDT until August 21 at 8:00PM PDT by NWS Las Vegas NV

Summary: * 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. * WHERE...Portions of northwest Arizona, southeast California, and southern Nevada. * WHEN...From 10 AM PDT / MST Tuesday to 8 PM PDT / MST Friday. * IMPACTS...Heat-related illnesses increase significantly during extreme heat events.
Severity:  Severe    Effective:  August 17, 2026, 2:14 am      Expires:  August 17, 2026, 4:00 pm
Area:  Lake Havasu and Fort Mohave; Lake Mead - AZ side; Lake Mohave - AZ side; Hualapai Mountains; Northwest Deserts; Death Valley National Park; Eastern Mojave Desert, Including the Mojave National Preserve; Morongo Basin; Cadiz Basin; San Bernardino County-Upper Colorado River Valley; Northeast Clark County; Western Clark and Southern Nye County; Las Vegas Valley; Southern Clark County; Lake Mead - NV side; Lake Mohave - NV side


Extreme Heat Warning issued August 17 at 12:25AM MST until August 21 at 8:00PM MST by NWS Tucson AZ

Summary: * WHAT...Dangerously hot conditions with high temperatures ranging between 103 to 110 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...From 10 AM this morning to 8 PM MST Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.
Severity:  Severe    Effective:  August 17, 2026, 12:25 am      Expires:  August 17, 2026, 5:00 pm
Area:  Western Pima County Including Ajo/Organ Pipe Cactus National Monument; Tohono O'odham Nation including Sells; Tucson Metro Area including Tucson/Green Valley/Marana/Vail; South Central Pinal County including Eloy/Picacho Peak State Park; Southeast Pinal County including Kearny/Mammoth/Oracle; Upper Gila River and Aravaipa Valleys including Clifton/Safford


Extreme Heat Warning issued August 17 at 12:03AM MST until August 21 at 8:00PM MST by NWS Phoenix AZ

Summary: * WHAT...Dangerously hot conditions. Afternoon temperatures 109 to 112 expected. Major Heat Risk. * WHERE...The Phoenix metropolitan area. * WHEN...From 10 AM Monday to 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
Severity:  Severe    Effective:  August 17, 2026, 12:03 am      Expires:  August 17, 2026, 3:30 pm
Area:  Northwest Valley; Buckeye/Avondale; Deer Valley; Central Phoenix; North Phoenix/Glendale; Scottsdale/Paradise Valley; East Valley; South Mountain/Ahwatukee; Southeast Valley/Queen Creek


Extreme Heat Warning issued August 17 at 12:03AM MST until August 21 at 8:00PM MST by NWS Phoenix AZ

Summary: * WHAT...Dangerously hot and humid conditions. Afternoon temperatures 107 to 114 expected. Major Heat Risk. * WHERE...Portions of southwest Arizona and southeast California. * WHEN...From 10 AM MST /10 AM PDT/ Monday to 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.
Severity:  Severe    Effective:  August 17, 2026, 12:03 am      Expires:  August 17, 2026, 3:30 pm
Area:  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


Extreme Heat Warning issued August 17 at 12:03AM MST until August 21 at 8:00PM MST by NWS Phoenix AZ

Summary: * WHAT...Dangerously hot conditions. Afternoon temperatures 102 to 109 expected. Major Heat Risk. * WHERE...San Carlos. * WHEN...From 10 AM Tuesday to 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.
Severity:  Severe    Effective:  August 17, 2026, 12:03 am      Expires:  August 17, 2026, 3:30 pm
Area:  San Carlos


Extreme Heat Warning issued August 17 at 12:03AM MST until August 21 at 8:00PM MST by NWS Phoenix AZ

Summary: * WHAT...Dangerously hot conditions. Afternoon temperatures 106 to 114 expected. Major 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, and Tonopah Desert. * WHEN...From 10 AM Monday to 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
Severity:  Severe    Effective:  August 17, 2026, 12:03 am      Expires:  August 17, 2026, 3:30 pm
Area:  Aguila Valley; Tonopah Desert; Gila Bend; Cave Creek/New River; Fountain Hills/East Mesa; Northwest Pinal County; West Pinal County; Apache Junction/Gold Canyon; Sonoran Desert Natl Monument