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Extreme Heat Warning Issued for Southwest Deserts Until July 27

July 22, 2026 · wweather1 editorial · 2 min read

The National Weather Service (NWS) Las Vegas has issued an Extreme Heat Warning for portions of northwest Arizona, southeast California, and southern Nevada. This warning is in effect from Thursday, July 23, at 10 AM PDT/MST until Monday, July 27, at 8 PM PDT/MST.

Dangerously hot conditions are expected across the warned area. Afternoon temperatures in the desert valleys are forecast to climb into the 108 to 114 degree range. Temperatures may exceed 115 degrees along the Colorado River Valley and reach 120 degrees in Death Valley. Overnight lows are generally expected to range from 80 to 95 degrees.

The Extreme Heat Warning covers portions of northwest Arizona, southeast California, and southern Nevada, including the Greater Mojave Desert region. Specific areas include Lake Havasu and Fort Mohave, Lake Mead and Mohave on the Arizona side, Northwest Deserts, Death Valley National Park, and the Western and Eastern Mojave Deserts, including the Mojave National Preserve. Other affected locations are Morongo Basin, Cadiz Basin, San Bernardino County-Upper Colorado River Valley, and Northeast Clark.

Heat related illnesses are expected to increase significantly during this extreme heat event. Residents and visitors in the affected regions are advised to be aware of the serious health risks posed by the high temperatures.

Why it is dangerous and what to do

⚠️ Safety
• Drink plenty of fluids and stay in an air-conditioned room.
• Do not leave young children or pets in unattended vehicles.
• Limit strenuous outdoor activities to early morning or evening hours.
• Check on relatives and neighbors.
📊 The numbers, from wweather1 data
Las Vegas: now +40°, Clear.
That is 3° above the July climate norm.
The record for this date is +46° (2023).
Three-day forecast: 22 July: +42°/+30° · 23 July: +44°/+28° · 24 July: +45°/+30°
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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