Heat Advisory

Locations Affected

Riverside, CA ∙ Anaheim, CA ∙ Santa Ana, CA ∙ Irvine, CA ∙ San Bernardino, CA ∙ Ontario, CA ∙ Corona, CA ∙ Fontana, CA ∙ Rancho Cucamonga, CA ∙ Orange, CA

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service San Diego CA 213 AM PDT Wed Aug 20 2025 ...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM THURSDAY TO 8 PM PDT FRIDAY... * WHAT...Temperatures up to 95 expected. * WHERE...Orange County Inland Areas and Santa Ana Mountains and Foothills. * WHEN...From 10 AM Thursday to 8 PM PDT Friday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Thursday and Friday are expected to be the hottest days. 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. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

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