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December weather forecast in San Francisco

Average data for 10 years

December in San Francisco is the rainiest month of the year. In December, the weather in San Francisco is typically warm. Average daily high temperature in December is about 10 degrees above zero. On average, San Francisco has 11 rainy, 10 cloudy, and 9 sunny days in December. Decemberas well as January, February, and March is considered the most uncomfortable time to visit San Francisco.