Weather Alerts For Costa Mesa, CA

# HEADLINE -------------------- HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM TUESDAY TO 8 PM PDT FRIDAY # DETAILS -------------------- WHAT High temperatures in the mid 80s near the beaches to the lower to mid 90s for higher coastal terrain expected. WHERE Orange County Coastal Areas County. WHEN From 10 AM Tuesday to 8 PM PDT Friday. IMPACTS Heat related illnesses increase significantly during extreme heat events. Hot temperatures may cause heat illnesses. ISSUED AT Monday, August 24, 2026 at 10:04 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 -------------------- Orange County Coastal Areas Including the cities of Costa Mesa and Huntington Beach