San Francisco

Avg weather in December
9 Hrs per day
106 mm per month
71 % avg
7 Mph avg

San Francisco Weather in December

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What’s the weather like in San Francisco in December?

The climate in San Francisco in December is quite wet since rainy season has just begun. However, temperatures are quite mild and perfect for sightseeing and shopping without it being too hot.

Geographical influences

San Francisco weather in December is influenced by the region’s unique microclimate. This means that the weather fluctuates depending on where you are in the city. December is usually very damp and cold with temperatures plummeting to lows of 8°C at night. The city is located on top of a peninsula on the northwest coast of California and known for its iconic landmarks including the Golden Gate Bridge and the abandoned prison on Alcatraz Island.


December has an average temperature of 14°C, which is quite mild but it’s usually colder at night so make sure to bring a jacket out with you in the evening. Humidity levels are around 71% with winds racing along at 7mph. Each day has nine hours of sunshine and there’s an average rainfall of 106mm. This means it’s likely to rain during your stay since the rainfall spreads over ten days of the month.

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