Extreme Heat Warning

Locations Affected

Phoenix, AZ ∙ Gilbert, AZ ∙ Glendale, AZ ∙ Mesa, AZ ∙ Chandler, AZ ∙ Scottsdale, AZ ∙ Peoria, AZ ∙ Tempe, AZ ∙ Surprise, AZ ∙ Yuma, AZ

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service Phoenix AZ 927 AM MST Thu Aug 21 2025 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST FRIDAY... * WHAT...Dangerously hot conditions. Afternoon temperatures 109 to 115. Major Heat Risk. * WHERE...The Northwest Valley of the Phoenix Metro Area, The East Valley of the Phoenix Metro Area, Buckeye/Avondale, Deer Valley, Central Phoenix, North Phoenix/Glendale, and Scottsdale/Paradise Valley. * 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. 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.

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