Bay Area/ San Francisco

San Francisco Braces for Minor Coastal Flooding Amid Persistent Fog and Cooler Temperatures

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Published on July 23, 2025
San Francisco Braces for Minor Coastal Flooding Amid Persistent Fog and Cooler TemperaturesSource: Tobias Kleinlercher / Wikipedia, CC BY-SA 3.0, via Wikimedia Commons

Fog and sweater weather are the unstated dress code for San Francisco, and this week doesn't stray far from expectations. The National Weather Service in San Francisco has issued a Coastal Flood Advisory, warning of minor coastal flooding along the Bayshore from 9 PM Wednesday through 2 AM Thursday. Residents in low-lying areas near shorelines and tidal waterways should brace for up to one foot of inundation above ground level. According to the advisory, high tide at the San Francisco tidal gauge is expected to peak at 1.08 feet above normal.

Meanwhile, regarding temperature, The National Weather Service San Francisco, CA, has confirmed the persistence of cooler-than-normal conditions. Drizzle will likely make a cameo Thursday morning, contributing to a citywide grey canvas. "Despite the marine layer compression, it's still deep enough to support 1,000-1,500 foot cloud layer," the forecast discussion mentioned, signaling the likelihood of drizzle across the Bay Area and Central Coast. The skies are also expected to continue their gloomy streak with a minor tidal flooding side dish in the San Francisco Bay.

For boaters and ferry commuters, anticipate a mixed bag of conditions. The Marine section of the report paints an image of gentle to moderate northwesterly breezes tagged with slight to moderate seas through the upcoming week. But, that's not all. The marine layer that San Franciscans know all too well is set to come with drizzle, potentially every day of this week, to add a little more moisture to the already damp air.

Regarding air travel, the aviation outlook mirrors that of terrestrial travel. Expect a mixed bag of IFR-MVFR at the terminals with improvements to VFR conditions expected by the afternoon, as per the Area Forecast Discussion. High confidence is placed on MVFR ceilings, which will make an encore tonight at most terminals. Predictability is the name of the game for this week's forecast, whether you're planning to catch a flight or simply watching the planes skirt by the fog.