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HomeWeather news → NWS Issues Extreme Heat Warning for Portions of Arizona, California, and Nevada
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NWS Issues Extreme Heat Warning for Portions of Arizona, California, and Nevada

August 18, 2026 · wweather1 editorial · 2 min read

The National Weather Service has issued an Extreme Heat Warning for parts of northwest Arizona, southeast California, and southern Nevada, remaining in effect from Tuesday at 10 AM PDT until Friday at 8 PM PDT.

Dangerously hot conditions are expected during this weather event. Temperatures are anticipated to reach up to 115 to 118 degrees in Death Valley and the lower Colorado River Valley, while other areas will see highs ranging between 107 to 110 degrees.

The affected regions include Lake Havasu and Fort Mohave, the Arizona sides of Lake Mead and Lake Mohave, the Hualapai Mountains, Northwest Deserts, Death Valley National Park, and the Eastern Mojave Desert including the Mojave National Preserve. Other impacted areas are the Morongo Basin, Cadiz Basin, San Bernardino County-Upper Colorado River Valley, and Northeast Clark County.

According to the National Weather Service, the risk of heat-related illnesses increases significantly during extreme heat events. Residents in the affected areas 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, stay in an air-conditioned room, and stay out of the sun.
• Check up on relatives and neighbors, and never leave young children or pets in unattended vehicles.
• Wear lightweight and loose-fitting clothing, and limit strenuous activities to the early morning or evening.
• Schedule frequent rest breaks in shaded or air-conditioned environments if working outdoors, and call 911 in case of heat stroke emergencies.
📊 The numbers, from wweather1 data
Las Vegas: now +32°, Clear.
That is 5° above the August climate norm.
The record for this date is +45° (2020).
Three-day forecast: 18 August: +43°/+28° · 19 August: +42°/+26° · 20 August: +43°/+35°
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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