San Diego/ Weather & Environment

Foggy Dawn, Searing Doom: San Diego Coast Faces Weeklong Extreme Heat Wave

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Published on October 02, 2026
Foggy Dawn, Searing Doom: San Diego Coast Faces Weeklong Extreme Heat WaveSource: Google Street View

San Diego is waking up to fog and mist Friday before the clouds burn off and a dangerous stretch of heat takes over. Temperatures at the beaches will reach around 90 degrees by afternoon, while western valleys could reach 100 to 105 degrees, with sunny skies expected for most of the day.

The National Weather Service San Diego has issued an Extreme Heat Warning for San Diego County coastal areas from 10 a.m. Friday through 8 p.m. Thursday, Oct. 8. Forecasters say heat-related illnesses will become significantly more likely during the prolonged event, with very warm overnight temperatures offering little relief.

Saturday Could Reach 100 Degrees

Skies will stay mostly clear, with lows in the 70s Saturday. Saturday is expected to be the hottest day of the immediate forecast, bringing sunshine and a high near 100, while stronger Santa Ana winds could gust 35 to 45 mph across inland valleys and nearby mountain areas.

Sunday will remain sunny but slightly cooler, with a high around 95 and an overnight low near 76. Monday through Thursday will bring mid-80s near beaches, mid-to-upper 90s in elevated and inland coastal areas, and mostly mid-90s to 105 degrees in valleys, with temperatures easing later in the period and mostly clear skies.

Heat Safety Remains The Main Concern

Residents should limit strenuous outdoor activity during the hottest part of the day, drink plenty of fluids and use air conditioning or other cool spaces when possible. Never leave children or pets in a parked vehicle, even briefly, because car interiors can become dangerously hot within minutes.