Extreme Heat Warning

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service San Diego CA 905 PM PDT Thu Aug 27 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY... * WHAT...Dangerously hot conditions with high temperatures in the upper 90s in the western valleys to around 103 in the inland valleys expected. Low temperatures will be mostly in the 70s. * WHERE...San Diego County Valleys. * WHEN...Until 8 PM PDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Low temperatures 5 to 10 degrees above normal will limit overnight relief from the heat and will increase the threat of heat-related illness. 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. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.