Weather Alerts For Descanso, CA

# HEADLINE -------------------- EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY # DETAILS -------------------- WHAT Dangerously hot conditions with high temperatures in the mid 90s to 102 expected. WHERE San Diego County Mountains. WHEN Until 8 PM PDT Friday. IMPACTS Heat related illnesses increase significantly during extreme heat events. Hot temperatures may cause heat illnesses. ADDITIONAL DETAILS Low temperatures 10 to 15 degrees above normal will limit relief from the heat. Increasing temperatures through Friday will increase the threat of heat-related illness across populations. ISSUED AT Tuesday, August 25, 2026 at 12:19 PM 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 Diego County Mountains Including the cities of Pine Valley and Julian