Weather in San Francisco in January Temperature, Rainfall, Sunshine... for January 2026

In January, San Francisco usually has moderate temperatures and moderate rainfall. The daytime often sees temperatures reaching 14°C, but nighttime brings a cool-down to 7°C. Precipitation San Francisco in January usually receives moderate rainfall, averaging around 70 mm for the month. Things to Do in January . Watch a Basketball Game: The NBA's Golden State Warriors (who once played basketball in Oakland) now have a home in San Francisco's Chase Center. Watch a Football Game: The San Francisco 49ers might be playing at home while you're there, but they play at Levi Stadium miles south in Santa Clara.Check their home game schedule on their website.

Get the monthly weather forecast for San Francisco, CA, including daily high/low, historical averages, to help you plan ahead.. The sun's rays reach the ground in San Francisco during 56 percent of daylight hours on average in January, for a total of 172 hours in the month. Typically on 9 days this month the sky is mainly clear, with at most 30 percent cloud cover. Sunlight in January at San Francisco lasts for 9 hours and 54 minutes a day on average.