Extreme Heat Lingers; Severe Thunderstorms for Portions of the Plains and Southeast; Heavy Rainfall Threats

Gusty winds and heavy rainfall may impact the Big Island of Hawaii as a nearby tropical system passes west of the islands. From the Southwest U.S., Rockies and across the Gulf Coast, heavy rainfall could lead to isolated flash flooding. Severe thunderstorms are expected for areas of the Plains, Gulf Coast and Southeast through Tuesday. Extreme heat lingers for the southern Plains and Southwest. Read More >

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Last Map Update: Mon, Aug 24, 2026 at 9:38:22 am 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

Small Craft Advisory

Extreme Heat Watch

Summer's Heat Continues across the Valley

Widespread Moderate Heat Risk

Desert Extreme Heat Warning

Triple Digit Heat Continues

After 100 plus-degree heat took hold over central California the last few weeks, more seasonable temperatures have been seen this week. Widespread Minor Heat Risk will continue with patches of Moderate Heat Risk, which is heat tolerated by most of the population, but can cause heat-related illnesses from those extremely sensitive to heat such as older adults (65+), infants, those without effective cooling, and those with chronic diseases (heart disease, obesity, poor blood circulation) to those who may overexert themselves with outdoor activities. Heat Risk will slowly rise to more widespread Moderate Heat Risk on Sunday before temperatures stabilize next week.

(Updated 8/23 4:30 PM) - Widespread Moderate Heat Risk is expected across the San Joaquin Valley and adjacent lower foothills (including Lake Isabella) as temperatures range from 100 to 104 degrees from Monday through at least Wednesday. Moderate Heat Risk affects those who are sensitive to heat, especially those without cooling/hydration, and some health systems and industries. A Heat Advisory has been issued for the southern San Joaquin Valley valid from Monday through late Wednesday evening.

Widespread Moderate to Major Heat Risk is expected across the Mojave Desert as temperatures reach up to 108 degrees from Monday through at least Wednesday. Morning low temperatures between 75 and 80 degrees will provide little overnight relief from the heat. This level of heat brings a Major Risk of heat-related illnesses for much of the population, especially those without effective cooling or hydration.

The high pressure ridge will once again sit itself over the West Coast this week. With that, max temperatures will range from 100 to 104 degrees across the San Joaquin Valley, Lower Foothills and the Mojave Desert. Best chances for the heat will be today through Wednesday with chances dropping off later in the week.