National Weather Service United States Department of Commerce

Extreme Heat and Fire Weather Conditions in the West; Heavy Rain in the Southeast; Poor Air Quality

Extreme heat will begin to peak across the Desert Southwest. Multiple days of hot, dry and windy conditions are expected to bring fire weather concerns for portions of the Four Corners region into the central Great Basin and Rockies. Heavy rainfall and a flash flooding threat continues in the Southeast. Poor air quality persists from the Upper Midwest into the Northeast due to wildfire smoke. Read More >

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Last Map Update: Tue, Aug 5, 2025 at 10:38:13 pm PDT

High pressure gradually building westward into the weekend will cause temperatures to increase and minimum relative humidity to decrease. Widespread RH values between 15 and 20 percent are anticipated, with a 50 to 80 percent chance for afternoon highs greater than 100 degrees in the San Joaquin Valley.
A gradual warming trend will cause highs in the San Joaquin Valley to extend above 100 degrees towards the end of the week and over the weekend as high pressure builds in aloft. This image shows the probability for afternoon highs to exceed 100 degrees on Thursday.

 

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