Severe · Extreme Heat WarningActive alert
Extreme Heat Warning issued October 3 at 9:40PM PDT until October 8
Affecting Santa Ana Mountains and Foothills
In effect until: Oct 4, 2026, 1:15 PM
Santa Ana Mountains and Foothills
Likely impact; effects through 1:15 PM.
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.
Read the original bulletin (official text)
* WHAT...Dangerously hot conditions with temperatures up to 100 and warm nights with lows in the low to mid 70s. * WHERE...Santa Ana Mountains and Foothills. * WHEN...Until 8 PM PDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™