Heat Advisory

Locations Affected

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

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service San Diego CA 302 AM PDT Tue Jul 21 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM WEDNESDAY TO 8 PM PDT MONDAY... * WHAT...High temperatures in the mid 80s to mid 90s below 6500 feet with low temperatures in the mid 60s to mid 70s expected. * WHERE...Riverside County Mountains, San Bernardino County Mountains, and San Diego County Mountains. * WHEN...From 10 AM Wednesday to 8 PM PDT Monday. * IMPACTS...Hot temperatures may cause heat illnesses. 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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