Heat Persists in the Southwest; Elevated to Critical Fire Weather in the Great Basin; Poor Air Quality in the West

Dangerous heat will persist across the Southwest U.S. through this week, easing by next week. The heat will focus further east in the Great Plains and Mississippi Valley beginning next week. Elevated to locally critical fire weather conditions will persist for the Great Basin today. Poor air quality lingers for the Northwest, Great Basin, Central Rockies into the Plains. Read More >

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Last Map Update: Tue, Aug 4, 2026 at 12:16:30 pm PDT

Watches, Warnings & Advisories

National Weather Service San Francisco Bay Area, CA

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National Weather Service Los Angeles, CA

Extreme Heat Warning

Heat Advisory

Dangerous Heat

Dangerous Desert Heat

Elevated Fire Danger through This Week

UPDATED Monday, August 3rd, 2026: The Heat Advisory is now in effect until 8 PM PDT Wednesday. Dangerous Heat will continue in the San Joaquin Valley, west side hills, lower Sierra Nevada foothills, Lake Isabella, and the Kern River Valley until at least Wednesday. Widespread triple digit heat will persist in these areas with overnight lows in the 70s at the hottest locations.

Monday, August 3, 2026 - The Extreme Heat Warning is now in effect for the Indian Wells Valley, the Mojave Desert and Mojave Desert Slopes in eastern Kern County through 8 PM Wednesday. Afternoon highs up to 112 degrees are expected, and morning lows in the mid 70s to lower 80s will provide little relief. Stay hydrated, use air conditioning and remain in cool places during the day, and avoid outdoor activities during the warmest parts of the day.

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Heat Persists in the Southwest; Elevated to Critical Fire Weather in the Great Basin; Poor Air Quality in the West

NWS Forecast Office Hanford, CA