Highlights

EXTREME HEAT WARNING: The National Weather Service in Phoenix issued an Extreme Heat Warning covering Scottsdale, Paradise Valley, and eight other Phoenix metro zones effective 10 a.m. Sunday through 8 p.m. MST Monday, May 11.

Afternoon temperatures of 105 to 109 degrees are expected across the Northwest Valley, East Valley, Buckeye/Avondale, Deer Valley, Central Phoenix, North Phoenix/Glendale, South Mountain/Ahwatukee, and Southeast Valley/Queen Creek. NWS has rated the event as Major Heat Risk.

The agency warns that heat-related illnesses increase significantly during extreme heat events, with overexposure capable of progressing from heat cramps and heat exhaustion to heat stroke without intervention. Anyone overcome by heat should be moved to a cool, shaded location immediately; heat stroke requires a call to 911.

NWS recommends rescheduling strenuous outdoor activity to early morning or evening, wearing lightweight and loose-fitting clothing, and drinking plenty of water. For outdoor workers, the agency cites Occupational Safety and Health Administration guidance calling for frequent rest breaks in shaded or air-conditioned environments.

Maricopa County residents can call 2-1-1 to find a free cooling center, transportation, and water. Additional resources are available at maricopa.gov/heat.

The warning remains in effect until 8 p.m. MST Monday, May 11.

Sources

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  1. api.weather.gov retrieved 09/05/2026 07:36

Authored by The Scottsdale Signal. Drafted by AI from primary-source material under our beat-specific editorial guides; reviewed by humans before publish under our five-gate process. Sources retrieved at 09/05/2026 07:36. Every claim traces to a source.