Extreme Heat Watch

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service San Diego CA 158 AM PDT Mon Aug 18 2025 ...EXTREME HEAT WATCH REMAINS IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY EVENING... * WHAT...Dangerously hot conditions with temperatures of 99 to 104 possible. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN...From Thursday morning through Friday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. 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.