Arizona Severe Extreme Heat Warning | Effective 08/01/2026 20:22

Headline: 
Extreme Heat Warning issued August 1 at 8:22PM MST until August 3 at 8:00PM MST by NWS Tucson AZ
Event: 
Extreme Heat Warning
Urgency: 
Expected
Effective: 
August 1, 2026 - 8:22pm
Expires: 
August 2, 2026 - 7:00am
Description: 
* 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...South Central Pinal County, Southeast Pinal County, Tohono O'odham Nation, Tucson Metro Area, 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.
Instruction: 
Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. 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.
Area Description: 
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
Forcast Office: 
NWS Tucson AZ
Sender: 
w-nws.webmaster@noaa.gov