Cool image from NASA shows why San Francisco gets so foggy: In short, the Pacific Ocean’s marine layer… cool, heavy air produced by a colder ocean surface meeting warmer air—encroaching on the metropolis. Western winds push the marine layer over the city, which brings dense cloud cover over the city, and often engulfs buildings, bridges, and people in fog.This weather pattern is most common in the summer due to shifts in the California Current which brings an upwelling of frigid, deep water to the surface of the ocean. Once the cold water meets the warmer air, the marine layer is formed, blanketing San Francisco in its iconic fog.
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Cool image from NASA shows why San Francisco gets so foggy:

In short, the Pacific Ocean’s marine layer… cool, heavy air produced by a colder ocean surface meeting warmer air—encroaching on the metropolis. Western winds push the marine layer over the city, which brings dense cloud cover over the city, and often engulfs buildings, bridges, and people in fog.This weather pattern is most common in the summer due to shifts in the California Current which brings an upwelling of frigid, deep water to the surface of the ocean. Once the cold water meets the warmer air, the marine layer is formed, blanketing San Francisco in its iconic fog.

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