Severe · Extreme Heat WarningActive alert
Extreme Heat Warning issued September 9 at 2:58AM PDT until September 9
Affecting San Diego County Inland Valleys
In effect until: Sep 9, 2026, 10:30 PM
San Diego County Inland Valleys
Likely impact; effects through 10:30 PM.
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Read the original bulletin (official text)
* WHAT...For the Extreme Heat Warning, dangerously hot conditions with high temperatures in the mid 90s to 107 with low temperatures in the 70s expected. For the Heat Advisory, high temperatures in the mid 90s to 104 expected. * WHERE...San Diego County Valleys. * WHEN...For the Extreme Heat Warning, until 8 PM PDT this evening. For the Heat Advisory, from 8 PM this evening to 8 PM PDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Major to Extreme HeatRisk. Warm overnight temperatures will limit relief from the heat.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™