For the most part, San Francisco’s weather is temperate and, within limits, predictable although it has its own micro climate. San Francisco temperatures seldom dip below 40°F, or reach or exceed 90°F. Its summers are famously foggy; but for the summer visitor who hasn’t heard, it’s important to know about The City’s "natural air conditioner" - the fog. But it gives tourists the excuse to buy a souvenir SF sweatshirt or scramble to buy a windbreaker. It can be in the 80s downtown, and then the fog rolls in in the afternoon, shaving 30 degrees off the top. It can be in the 50s after the fog comes into The City, even as it’s still in the 90s in the surrounding counties to the north, east and south.
http://www.tripadvisor.com/Travel-g60713-s208/San-Francisco:California:Weather.And.When.To.Go.html
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