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NWS Issues Extreme Heat Warning for Phoenix Metropolitan Area

August 15, 2026 · wweather1 editorial · 2 min read

The National Weather Service in Phoenix has issued an Extreme Heat Warning for the Phoenix metropolitan area, effective from 10:00 AM MST Monday to 8:00 PM MST Friday.

The National Weather Service in Phoenix, Arizona, issued the warning on August 15 at 10:05 AM MST. The affected areas include the Northwest Valley, Buckeye/Avondale, Deer Valley, Central Phoenix, North Phoenix/Glendale, Scottsdale/Paradise Valley, East Valley, South Mountain/Ahwatukee, and Southeast Valley/Queen Creek.

Dangerously hot conditions are expected, with a Major Heat Risk forecast for the area. Afternoon temperatures are predicted to reach between 109 and 113, while overnight lows will range from 88 to 92.

According to the weather agency, heat-related illnesses increase significantly during extreme heat events. Overexposure can lead to heat cramps and heat exhaustion, which can progress to heat stroke without intervention.

For residents in Maricopa County, community support is available by calling 2-1-1 or visiting https://www.maricopa.gov/heat to find free cooling centers, transportation, and water.

Why it is dangerous and what to do

⚠️ Safety
• Drink plenty of water and wear lightweight, loose-fitting clothing.
• Reschedule strenuous outdoor activities to early morning or evening hours.
• Take frequent rest breaks in shaded or air-conditioned environments if working outside.
• Move anyone overcome by heat to a cool location and call 911 immediately for heat stroke.
📊 The numbers, from wweather1 data
Phoenix: now +40°, Clear.
That is 1° above the August climate norm.
The record for this date is +46° (2015).
Three-day forecast: 15 August: +41°/+28° · 16 August: +43°/+27° · 17 August: +43°/+27°
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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