San Diego woke to a 70-degree foggy start Sunday, but the gray coastal morning is not sticking around. Fog and mist should thin shortly after sunrise, giving way to a sunny afternoon near 85 degrees with light northwest winds.
Heat Watch Starts Tuesday
The bigger story arrives Tuesday, when an Extreme Heat Watch from the National Weather Service begins across San Diego County coastal areas and other parts of the region. The watch runs through Friday evening, with temperatures up to 93 possible in the coastal zones and overnight lows running 5 to 7 degrees above normal.
At the San Diego forecast point, tomorrow brings a small step down to 84, followed by highs near 83 on Tuesday, 85 on Wednesday, 87 on Thursday and Friday, and 88 on Saturday. Nighttime temperatures remain unusually warm, around 70 tomorrow and rising into the low 70s later in the week, which means less relief after sunset.
Foggy Mornings, Sunny Afternoons
Patchy fog is expected tomorrow night again after 11 PM and Tuesday morning before 11 AM, with mostly sunny skies once it clears. Rain is not a meaningful factor along the coast in this forecast, with daily precipitation chances remaining at 3% or lower; the better chance of isolated showers or thunderstorms remains over the mountains and lower deserts.
Beach Conditions Shift Wednesday
A 4- to 5-foot southerly swell is expected to move in on Wednesday and Thursday, producing 4- to 6-foot breaking waves at south-facing beaches in northern San Diego County and Orange County. Local sets could reach 8 feet, while broader marine conditions are expected to remain non-hazardous through Thursday.
Heat Safety Becomes The Priority
The National Weather Service advises drinking plenty of fluids, staying in air conditioning when possible, avoiding prolonged sun exposure and checking on relatives and neighbors during the heat event. San Diego County also maintains a network of free, air-conditioned Cool Zones for people who need a break from the heat.
For outdoor plans, the safest window will be early in the day, before the hottest stretch from roughly 10 AM to 4 PM. Keep children and pets out of parked cars, and remember that warm overnight temperatures can be especially hard on people without reliable cooling.
