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Updated:August 21, 2026 7:15 pm PDT

Heat Advisory HEAT ADVISORY  
Orange County
Effective: Fri, 8/21 12:58pm Severity:  Moderate 
Updated: August 21, 2026 7:15 pm Urgency: Expected
Expires: Fri, 8/21 9:00pm Certainty: Likely
Areas Affected: San Bernardino and Riverside County Valleys-The Inland Empire - San Diego County Inland Valleys - Riverside County Mountains - Santa Ana Mountains and Foothills - San Diego County Mountains - Orange County Inland
 
Alert Details: 
* WHAT...Temperatures 90 to 97 for Inland Orange County, 90 to 102
for inland San Diego County, 98 to 106 for the Inland Empire and
89 to 99 in the mountains.

* WHERE...Orange County Inland Areas, Riverside County Mountains,
San Bernardino and Riverside County Valleys-The Inland Empire, San
Diego County Mountains, San Diego County Valleys, and Santa Ana
Mountains and Foothills.

* WHEN...From 10 AM Saturday to 8 PM PDT Monday.

* IMPACTS...Hot temperatures may cause heat illnesses.

Information: 
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.