San Francisco weather in January 2027

Q: How hot is it in San Francisco in January?

Daytime temperatures usually reach 20°C in San Francisco in January, falling to 8°C at night.

Q: How sunny is it in San Francisco in January?

There are normally 7 hours of bright sunshine each day in San Francisco in January - that's 70% of daylight hours.

Q: Does it rain in San Francisco in January?

There are usually 5 days with some rain in San Francisco in January and the average monthly rainfall is 80mm.

Expect daytime maximum temperatures of 13°C in San Francisco, California in January based on long-term weather averages. There are 6 hours of sunshine per day on average with 10 days with some rainfall and typically 125 mm of rainfall in the month.

13
13°C max day temperature
6
6 hours of sunshine per day
10
10 days with some rainfall
7
7°C min night temperature
10
10 hours of daylight per day
0
No heat & humidity
125
125 mm of monthly rainfall
2
2 (Low) UV index
11
11°C sea temperature

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The January weather guide for California (San Francisco) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)

More about San Francisco

How hot is it in San Francisco in January?

Daytime temperatures usually reach 20°C in San Francisco in January, falling to 8°C at night.

How sunny is it in San Francisco in January?

There are normally 7 hours of bright sunshine each day in San Francisco in January - that's 70% of daylight hours.

Does it rain in San Francisco in January?

There are usually 5 days with some rain in San Francisco in January and the average monthly rainfall is 80mm.

San Francisco January sunrise & sunset times

Browse the sunrise and sunset times for San Francisco in January 2027. Select a month to view San Francisco sunrise and sunset times for the next 12 months.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec