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Extreme Heat Warning Issued for Phoenix Metropolitan Area

September 8, 2026 · wweather1 editorial · 2 min read

The National Weather Service in Phoenix has issued an Extreme Heat Warning effective from 10:00 AM MST on September 8 until 8:00 PM MST on September 10. Afternoon temperatures between 105 and 109 degrees are expected, creating a major heat risk.

The National Weather Service in Phoenix, Arizona, has placed the entire Phoenix metropolitan area under an Extreme Heat Warning due to dangerously high temperatures. The warning officially began at 10:00 AM MST on September 8 and is set to expire at 8:00 PM MST on September 10.

Specific areas included in the warning are Central Phoenix, North Phoenix, Glendale, Scottsdale, Paradise Valley, Deer Valley, Cave Creek, New River, Buckeye, Avondale, Fountain Hills, East Mesa, South Mountain, Ahwatukee, and the Southeast Valley including Queen Creek.

Health officials and weather authorities warn that heat-related illnesses rise significantly during extreme heat events. Overexposure can quickly cause heat cramps and heat exhaustion, which can progress to heat stroke without proper intervention.

Residents in Maricopa County can access resources by calling 2-1-1 or visiting maricopa.gov/heat. Public cooling shelters, free transportation to shelters, and water distribution services are available to help mitigate the effects of the extreme temperatures.

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.
• Recognize the signs of heat exhaustion and heat stroke, and call 911 if a heat emergency occurs.
📊 The numbers, from wweather1 data
Phoenix: now +32°, Mostly clear.
That is 6° above the September climate norm.
The record for this date is +43° (1979).
Three-day forecast: 8 September: +43°/+29° · 9 September: +42°/+29° · 10 September: +42°/+33°
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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