Weather Warnings for Arizona

Issued by the National Weather Service

Current watches, warnings, and advisories for Arizona
Alerts Updated: August 1, 2026, 8:37 pm  UTC


Extreme Heat Warning issued August 1 at 12:19PM MST until August 3 at 8:00PM MST by NWS Phoenix AZ

Summary: * WHAT...Dangerously hot conditions. Afternoon temperatures 108 to 119. Major to Extreme Heat Risk. * WHERE...Mostly rural portions of southwest Arizona and southeast California, including Joshua Tree National Park. * WHEN...Until 8 PM MST /8 PM PDT/ Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.
Severity:  Severe    Effective:  August 1, 2026, 12:19 pm      Expires:  August 2, 2026, 5:00 am
Area:  Kofa; Central La Paz; Southeast Yuma County; Gila River Valley; Joshua Tree NP West; Joshua Tree NP East; Imperial County Southwest; Salton Sea; Chuckwalla Mountains; Imperial County Southeast; Imperial County West; Chiriaco Summit


Extreme Heat Warning issued August 1 at 12:19PM MST until August 3 at 8:00PM MST by NWS Phoenix AZ

Summary: * WHAT...Dangerously hot conditions. Afternoon temperatures 110 to 117. Major to Extreme Heat Risk. * WHERE...The Phoenix metropolitan area. * WHEN...Until 8 PM MST Monday. * IMPACTS...Increase in heat related illnesses, including heat cramps, heat exhaustion, and heat stroke. Heat stroke can lead to death. * 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 1, 2026, 12:19 pm      Expires:  August 2, 2026, 5:00 am
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 1 at 12:19PM MST until August 3 at 8:00PM MST by NWS Phoenix AZ

Summary: * WHAT...Dangerously hot conditions. Afternoon temperatures 109 to 118. Major to Extreme Heat Risk. * WHERE...Mostly rural areas of Maricopa County and northern Pinal County. * WHEN...Until 8 PM MST Monday. * IMPACTS...Increase in heat related illnesses, including heat cramps, heat exhaustion, and heat stroke. Heat stroke can lead to death. * 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 1, 2026, 12:19 pm      Expires:  August 2, 2026, 5:00 am
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


Extreme Heat Warning issued August 1 at 12:19PM MST until August 3 at 8:00PM MST by NWS Phoenix AZ

Summary: * WHAT...Dangerously hot conditions. Afternoon temperatures 98 to 114. Major to Extreme Heat Risk. * WHERE...Southern Gila County and portions of northern Pinal County and eastern Maricopa County. * WHEN...Until 8 PM MST Monday. * IMPACTS...Increase in heat related illnesses, including heat cramps, heat exhaustion, and heat stroke. Heat stroke can lead to death.
Severity:  Severe    Effective:  August 1, 2026, 12:19 pm      Expires:  August 2, 2026, 5:00 am
Area:  New River Mesa; Rio Verde/Salt River; Superior; Tonto Basin; Mazatzal Mountains; Pinal/Superstition Mountains; San Carlos; Dripping Springs; Globe/Miami; Southeast Gila County


Extreme Heat Warning issued August 1 at 12:19PM MST until August 3 at 8:00PM MST by NWS Phoenix AZ

Summary: * WHAT...Dangerously hot conditions. Afternoon temperatures 112 to 120. Major to Extreme Heat Risk. * WHERE...In Arizona, Parker Valley and Yuma. In California, Chuckwalla Valley, Imperial Valley, and Palo Verde Valley. * WHEN...Until 8 PM MST /8 PM PDT/ Monday. * IMPACTS...Increase in heat related illnesses, including heat cramps, heat exhaustion, and heat stroke. Heat stroke can lead to death.
Severity:  Severe    Effective:  August 1, 2026, 12:19 pm      Expires:  August 2, 2026, 5:00 am
Area:  Parker Valley; Yuma; Imperial Valley; Palo Verde Valley; Chuckwalla Valley


Extreme Heat Warning issued August 1 at 11:27AM MST until August 3 at 8:00PM MST by NWS Flagstaff AZ

Summary: * WHAT...Dangerously hot conditions, with temperatures around 108 to 115 degrees expected below 4000 feet. * WHERE...Northern Gila and Yavapai counties below 4000 feet; including the Verde Valley and Black Canyon City. * WHEN...Until 8 PM MST Monday. * IMPACTS...Most individuals will be at risk for heat-related illnesses without effective cooling or adequate hydration, especially with prolonged outdoor exposure.
Severity:  Severe    Effective:  August 1, 2026, 11:27 am      Expires:  August 3, 2026, 8:00 pm
Area:  Northern Gila County; Yavapai County Valleys and Basins


Extreme Heat Warning issued August 1 at 11:27AM MST until August 3 at 8:00PM MST by NWS Flagstaff AZ

Summary: * WHAT...Dangerously hot conditions, with temperatures around 105 to 110 degrees expected. * WHERE...Marble Canyon, Glen Canyon, and Oak Creek Canyon; including Page and Sedona. * WHEN...Until 8 PM MST /9 PM MDT/ Monday. * IMPACTS...Most individuals will be at risk for heat-related illnesses without effective cooling or adequate hydration, especially with prolonged outdoor exposure.
Severity:  Severe    Effective:  August 1, 2026, 11:27 am      Expires:  August 3, 2026, 8:00 pm
Area:  Marble and Glen Canyons; Oak Creek and Sycamore Canyons


Heat Advisory issued August 1 at 11:27AM MST until August 3 at 8:00PM MST by NWS Flagstaff AZ

Summary: * WHAT...Temperatures of 100 to 106 degrees expected. * WHERE...Little Colorado River Valley and the lower elevations of Navajo Nation in Arizona; including the Kaibito Plateau, Painted Desert, and Chinle Valley. * WHEN...Until 8 PM MST /9 PM MDT/ Monday. * IMPACTS...Pets, livestock, and those sensitive to heat, such as the homeless, elderly, and children will be at risk for heat-related illnesses. Those without effective cooling and/or adequate hydration will be at the greatest risk.
Severity:  Moderate    Effective:  August 1, 2026, 11:27 am      Expires:  August 3, 2026, 8:00 pm
Area:  Northeast Plateaus and Mesas Hwy 264 Northward; Chinle Valley; Little Colorado River Valley in Coconino County; Little Colorado River Valley in Navajo County; Little Colorado River Valley in Apache County; Northeast Plateaus and Mesas South of Hwy 264


Extreme Heat Warning issued August 1 at 11:27AM MST until August 4 at 8:00PM MST by NWS Flagstaff AZ

Summary: * WHAT...Dangerously hot conditions expected below 4000 feet, with daytime temperatures ranging from 103 to 108 degrees at Havasupai Gardens, and 111 to 115 degrees at Phantom Ranch. * WHERE...Lower elevations of the Grand Canyon. * WHEN...Until 8 PM MST Tuesday. * IMPACTS...Most individuals will be at risk for heat-related illnesses without effective cooling or adequate hydration, especially with prolonged outdoor exposure.
Severity:  Severe    Effective:  August 1, 2026, 11:27 am      Expires:  August 3, 2026, 8:00 pm
Area:  Grand Canyon Country


Extreme Heat Warning issued August 1 at 3:17AM MST until August 3 at 8:00PM MST by NWS Tucson AZ

Summary: * WHAT...Dangerously hot conditions with temperatures 101 to 106 in Santa Cruz and Cochise Counties and 107 to 113 elsewhere. Major to Extreme HeatRisk is expected. * WHERE...Eastern Cochise County below 5000 feet, South Central Pinal County, Southeast Pinal County, Tohono O'odham Nation, Tucson Metro Area, Upper Gila River Valley, Upper San Pedro River Valley, Upper Santa Cruz River Valley/Altar Valley, and Western Pima County. * WHEN...Until 8 PM MST Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Warm overnight low temperatures of 84 to 90 degrees in the deserts will provide little to no relief from heat overnight. Warmest overnight low temperatures expected in the Western Deserts.
Severity:  Severe    Effective:  August 1, 2026, 3:17 am      Expires:  August 1, 2026, 5:00 pm
Area:  Western Pima County Including Ajo/Organ Pipe Cactus National Monument; Tohono O'odham Nation including Sells; Upper Santa Cruz River and Altar Valleys including Nogales; 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 San Pedro River Valley including Sierra Vista/Benson; Eastern Cochise County Below 5000 Feet including Douglas/Willcox; Upper Gila River and Aravaipa Valleys including Clifton/Safford


Extreme Heat Warning issued July 31 at 2:56PM PDT until August 2 at 8:00PM PDT by NWS Las Vegas NV

Summary: * WHAT...Dangerously hot conditions with highs 110 to 120 degrees across the Mojave Desert. Highs 100 to 110 degrees across most of the southern Great Basin and Arizona Strip. Little to no overnight relief is expected, particularly in the Mojave Desert where lows of 80 to 95 degrees are forecast. This will result in Major-to-Extreme Heat Risk. * WHERE...Portions of northwest Arizona, southeast California, and south central and southern Nevada. * WHEN...Until 8 PM PDT /8 PM MST/ Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.
Severity:  Severe    Effective:  July 31, 2026, 2:56 pm      Expires:  August 1, 2026, 6:00 pm
Area:  Northwest Plateau; Lake Havasu and Fort Mohave; Lake Mead - AZ side; Lake Mohave - AZ side; Hualapai Mountains; Northwest Deserts; Death Valley National Park; Western Mojave Desert; Eastern Mojave Desert, Including the Mojave National Preserve; Morongo Basin; Cadiz Basin; San Bernardino County-Upper Colorado River Valley; Owens Valley South; Owens Valley North; Esmeralda and Central Nye County; Lincoln County; Northeast Clark County; Western Clark and Southern Nye County; Las Vegas Valley; Southern Clark County; Lake Mead - NV side; Lake Mohave - NV side