Highlights
- NWS Phoenix issued an Extreme Heat Warning effective 10 a.m. Monday through 8 p.m. Friday, Aug. 21.
- Afternoon temperatures of 109 to 112 degrees are expected across Scottsdale, Paradise Valley, and the broader Phoenix metro.
- Maricopa County residents can call 2-1-1 to locate free cooling centers, transportation, and water.
- Heat stroke is a medical emergency; OSHA recommends frequent rest breaks in shaded or air-conditioned environments for outdoor workers.
The National Weather Service issued an Extreme Heat Warning for Scottsdale, Paradise Valley, and the broader Phoenix metropolitan area beginning 10 a.m. Monday and running through 8 p.m. Friday, Aug. 21. Afternoon temperatures of 109 to 112 degrees are forecast across the warning zone, which spans Northwest Valley, Buckeye/Avondale, Deer Valley, Central Phoenix, North Phoenix/Glendale, East Valley, South Mountain/Ahwatukee, and Southeast Valley/Queen Creek.
NWS Phoenix characterizes conditions as posing a Major Heat Risk. The agency warns that overexposure can cause heat cramps and heat exhaustion and, without intervention, can progress to heat stroke. Anyone overcome by heat should be moved to a cool, shaded location immediately; heat stroke requires a call to 9-1-1.
For outdoor workers, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air-conditioned environments during the warning period.
Maricopa County residents can call 2-1-1 to find a free cooling center, transportation, water, and additional resources. More information is available at maricopa.gov/heat.
The warning remains in effect until 8 p.m. Friday, Aug. 21.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- api.weather.gov retrieved 17/08/2026 07:05
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 17/08/2026 07:05. Every claim traces to a source.
