California Severe Extreme Heat Warning | Effective 10/04/2026 11:32

Headline: 
Extreme Heat Warning issued October 4 at 11:32AM PDT until October 8 at 8:00PM PDT by NWS San Diego CA
Event: 
Extreme Heat Warning
Urgency: 
Expected
Effective: 
October 4, 2026 - 11:32am
Expires: 
October 4, 2026 - 10:00pm
Description: 
* 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.
Instruction: 
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. Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution.
Area Description: 
Santa Ana Mountains and Foothills
Forcast Office: 
NWS San Diego CA
Sender: 
w-nws.webmaster@noaa.gov