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NWS Issues Extreme Heat Warning for Phoenix Metropolitan Area Through August 29

August 25, 2026 · wweather1 editorial · 2 min read

The National Weather Service in Phoenix, Arizona, has issued an Extreme Heat Warning for the Phoenix metropolitan area, in effect from August 25 at 1:42 AM MST until August 29 at 8:00 PM MST.

Dangerously hot conditions are forecast for the region, with afternoon temperatures expected to reach between 106 and 116 degrees. The weather service warns that these conditions pose a Major to Extreme Heat Risk.

The warning covers multiple communities throughout the Phoenix metropolitan area, including Central Phoenix, Deer Valley, Northwest Valley, Buckeye/Avondale, North Phoenix/Glendale, Scottsdale/Paradise Valley, East Valley, South Mountain/Ahwatukee, and Southeast Valley/Queen Creek.

Officials caution that the sustained high temperatures will lead to an increase in heat-related illnesses, including heat cramps, heat exhaustion, and heat stroke. Heat stroke is a medical emergency that can result in death.

For residents in Maricopa County seeking assistance, information regarding free public cooling centers, transportation, and water can be obtained by dialing 2-1-1 or visiting maricopa.gov/heat.

Why it is dangerous and what to do

⚠️ Safety
• Reschedule strenuous outdoor activities to early morning or evening hours when possible.
• Drink plenty of water and wear lightweight, loose-fitting clothing.
• Schedule frequent rest breaks in shaded or air-conditioned environments if working outdoors.
• Move anyone overcome by heat to a cool location and call 911 immediately if heat stroke is suspected.
📊 The numbers, from wweather1 data
Phoenix: now +31°, Clear.
That is 6° above the August climate norm.
The record for this date is +45° (2011).
Three-day forecast: 25 August: +46°/+31° · 26 August: +48°/+32° · 27 August: +45°/+36°
The figures are computed automatically from the Open-Meteo/ERA5 archive — no eyeball estimates.

🌍 Weather in nearby cities

📰 Data source: NWS. Forecast and analysis — wweather1, based on Open-Meteo / met.no data.

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