Overview

• Heat warnings remain in effect through Tuesday for desert and inland areas, and San Diego County mountains face a heat advisory until Monday evening.
• The Bay Area’s inland valleys and parts of southeastern San Mateo and western Alameda counties are under a moderate HeatRisk designation.
• National Weather Service forecasts a cooling trend starting Wednesday with temperatures falling 3–5°F each day through Friday.
• Climate models predict readings will be 5–10°F below average by the weekend and stay low into early next week as the marine layer expands.
• Officials urge vulnerable populations to stay hydrated, limit outdoor exposure, never leave children or pets in vehicles, and follow heat-safety guidance.