Extreme Heat Watch

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service San Diego CA 1241 PM PDT Mon Aug 18 2025 ...EXTREME HEAT WATCH IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY EVENING... * WHAT...Dangerously hot conditions with high temperatures 95 to 100 degrees possible and low temperatures in the low 70s. * WHERE...Orange County Inland Areas and Santa Ana Mountains and Foothills. * WHEN...From Thursday morning through Friday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Above average temperatures overnight will limit overnight relief from the heat. Widespread moderate to locally major HeatRisk. 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.