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NWS Issues Extreme Heat Watch for Phoenix Metropolitan Area

August 13, 2026 · wweather1 editorial · 2 min read

The National Weather Service in Phoenix has issued an Extreme Heat Watch for the Phoenix metropolitan area from Monday morning through Wednesday evening. Afternoon temperatures are expected to reach between 108 and 112 degrees.

The National Weather Service office in Phoenix, Arizona, issued the watch on August 12 at 11:33 PM MST. Affected locations 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. The watch remains in effect until August 19 at 8:00 PM MST.

Forecasters report a Major Heat Risk during this period. Overexposure to these high temperatures significantly increases the risk of heat-related illnesses. Without proper intervention, exposure can lead to heat cramps, heat exhaustion, and heat stroke.

For residents in Maricopa County, local resources are available by calling 2-1-1 or visiting maricopa.gov/heat to locate free cooling centers, water, and transportation services. Public cooling shelters are operational in specific areas.

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.
• Schedule frequent rest breaks in shaded or air-conditioned areas if working outdoors.
• Move anyone overcome by heat to a cool location and call 911 if heat stroke is suspected.
📊 The numbers, from wweather1 data
Phoenix: now +38°, Overcast.
That is 1° below the August climate norm.
The record for this date is +46° (2020).
Three-day forecast: 14 August: +39°/+28° · 15 August: +41°/+27° · 16 August: +39°/+28°
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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