Average temperatures, rainfall and packing tips for San Francisco, United States in January
January in San Francisco is typically mild, with average daytime highs around 15°C and nights near 9°C. Temperature-wise it sits mid-range for San Francisco (the 9th warmest month).
January is one of the wetter months in San Francisco, with around 151 mm of rain - plan around showers.
If your dates are flexible, the most comfortable months in San Francisco are usually May, June, July, August, September and October.
← San Francisco weather tomorrow (live)
In January, San Francisco averages a daytime high of about 15°C and a night-time low of around 9°C, based on recent historical data.
January is one of the wetter months in San Francisco, with around 151 mm of rain - plan around showers.
January is a workable time to visit San Francisco, with mild days - just pack accordingly. If your dates are flexible, the most comfortable months in San Francisco are usually May, June, July, August, September and October.