Extreme Heat Warning

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service San Diego CA 744 PM PDT Wed Sep 9 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM PDT THURSDAY... * WHAT...For the Extreme Heat Warning, dangerously hot conditions with high temperatures in the 90s to 103 on Thursday with morning low temperatures in the 70s expected. * WHERE...San Diego County Valleys. * WHEN...Until 8 PM PDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Major to Extreme HeatRisk through today. Moderate to major HeatRisk on Thursday. Warm overnight temperatures will limit relief from the heat. 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.