Extreme Heat Warning

Locations Affected

Riverside, CA ∙ Santa Ana, CA ∙ Irvine, CA ∙ San Bernardino, CA ∙ Anaheim, CA ∙ Orange, CA ∙ Fullerton, CA ∙ Fontana, CA ∙ Moreno Valley, CA ∙ Garden Grove, CA

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service San Diego CA 1219 PM PDT Tue Aug 25 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY... * WHAT...Dangerously hot conditions with high temperatures in the mid 90s to 105 expected. Low temperatures will be mostly in the 70s. * WHERE...Orange County Inland Areas. * WHEN...Until 8 PM PDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Low temperatures 5 to 10 degrees above normal will limit relief from the heat. Increasing temperatures through Friday will increase the threat of heat-related illness across populations. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

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