Weather Alerts For Winchester, CA

# HEADLINE -------------------- HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM TO 8 PM PDT MONDAY # DETAILS -------------------- WHAT Temperatures 95 to 100 degrees. WHERE San Bernardino and Riverside County Valleys-The Inland Empire. WHEN From 10 AM to 8 PM PDT Monday. IMPACTS Hot temperatures may cause heat illnesses. ISSUED AT Sunday, May 10, 2026 at 3:05 AM PDT ISSUED BY National Weather Service San Diego CA HEADER URGENT - WEATHER MESSAGE # 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. # AREAS AFFECTED -------------------- San Bernardino and Riverside County Valleys, The Inland Empire Including the cities of Fontana, Ontario, Riverside, Moreno Valley, Rancho Cucamonga, San Bernardino, and Corona