Western US Heat Dome Brings Record Temperatures; Third Major Wave Since June
An intense heat dome is bringing dangerously hot temperatures across the West, affecting about 45 million people under heat alerts. Temperatures are reaching 110°F+ in parts of California, Nevada, Arizona, and the Rockies, with records likely to fall across six states through early August.
A Dangerous Summer Pattern
An unusually intense heat dome is bringing dangerous temperatures to parts of the West on Sunday, where about 45 million people are under heat alerts. Most of those people are in portions of California, Nevada and Arizona, although heat alerts stretch north to the Canadian border. Starting in late June 2026, North America has been struck by a severe heatwave. This is the third major heat dome since late June, following a brutal eastern US event in early July.
As a dangerous heat wave stays parked across the West through early this week, we could see more records fall across six states from California to Colorado. Triple-digit heat stretches from Las Vegas to Montana, with cooler pockets in between.
Why This Matters for Your Safety
Heat is the deadliest type of extreme weather in the US, with a higher annual death toll than tornadoes, hurricanes and lightning combined. This latest extreme weather is again raising the risk of heat-related illness, particularly for millions of people in the affected region who lack easy access to air conditioning.
If you're settling in western states, practical steps: Stay out of the sun as much as possible. Drink lots of water or a drink with electrolytes. Wear light-colored, loose-fitting clothing. If symptoms of heat stroke appear—confusion, slurred speech, or body temperature above 103°F—call 911 immediately. Many cities open free cooling centers during heat emergencies; check your local government website for locations.
Sources
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