San Francisco Weather in December

What's the weather like in San Francisco, United States in December 2018?

The climate in San Francisco during December can be summarized as mild and a little damp.

December is in the winter in San Francisco and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a cool 14°C (57°F), whilst at night 7°C (45°F) is normal.

San Francisco weather averages (imperial / metric)
Daytime temperature 13.7°C 56.6°F
Nightly temperature 7.2°C 44.9°F
Average temperature 10.4°C 50.7°F
Daily sunshine 5.7 hrs
Avg rainfall 97 mm 3.8 ins
Rainy days 10 days
Sea temperature 12.7°C 54.9°F
Humidity 79%
Windspeed 12.6kph 8 mph

On average December is the 2nd wettest month of the year in San Francisco with around 97mm 3.8 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.

On the flip side this corresponds to an average of 5.7 hours of sunshine per day.

December temperatures in San Francisco

December rainfall

December hourly sunshine

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in December 2018.

Other monthly averages

San Francisco weather stats

San Francisco weather statistics
Hottest month: September 21.4°C 70.5°F
Driest month: July 1mm 0ins
Sunniest month: April 11.1hrs
Coldest month: January 13.2°C 55.8°F
Wettest month: January 125mm 4.9ins
Map showing location of San Francisco (37.77493, -122.41942)

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