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NWS Issues Extreme Heat Warning for Parts of Arizona, California, and Nevada

August 22, 2026 · wweather1 editorial · 2 min read

The National Weather Service has issued an Extreme Heat Warning effective from August 21 at 7:31 PM PDT until August 23 at 8:00 PM PDT, bringing dangerously hot conditions to the region.

The National Weather Service in Las Vegas, NV, has issued an Extreme Heat Warning for multiple areas, including Lake Havasu and Fort Mohave, the Arizona and Nevada sides of Lake Mead and Lake Mohave, the Northwest Deserts, Death Valley National Park, the Upper Colorado River Valley in San Bernardino County, and the Las Vegas Valley.

Dangerously hot conditions with temperatures reaching up to 115 to 118 degrees are expected through Death Valley and the lower Colorado River Valley. Highs between 107 and 110 degrees are anticipated in other areas, alongside near-record warm low temperatures in urban settings.

The warning remains in effect until 8:00 PM PDT on Sunday, August 23. Authorities note that the risk of heat-related illnesses increases significantly during such extreme weather events.

Residents are advised to monitor the latest forecasts and warnings for ongoing updates.

Why it is dangerous and what to do

⚠️ Safety
• Drink plenty of fluids and stay in an air-conditioned room.
• Stay out of the sun and limit strenuous activities to the early morning or evening.
• Check up on relatives, neighbors, young children, and pets, and never leave children or pets in unattended vehicles.
• Wear lightweight and loose-fitting clothing, and take frequent rest breaks in shaded or air-conditioned environments if working outdoors.
📊 The numbers, from wweather1 data
Las Vegas: now +37°, Clear.
That is 4° above the September climate norm.
The record for this date is +42° (2021).
Three-day forecast: 8 September: +38°/+24° · 9 September: +41°/+25° · 10 September: +42°/+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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