Is San Francisco hot in December?
Days are typically cool at 14.7°C, while nights average 8.4°C.
United States · 1991–2020 normal
San Francisco in
December.
Typical December weather in San Francisco: 14.7°C by day, 8.4°C at night, 121 mm of rain over 9.5 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high14.7°C
Typical low8.4°C
Rain121 mm
Wet days9.5
In the year-round weather comparison, December scores 40 out of 100 (September leads the year at 89). Daylight is calculated as 9 h 34 from latitude 37.77°. Open-water sea temperature is 12.0°C (21 km from the place centre).
December at a glance
What is San Francisco like in December?
Plain answers from the measured climate record—not a forecast or a promise about a particular trip.
Does it rain much?
The measured monthly average is 121 mm across about 10 wet days.
How much daylight is there?
There are about 9 h 34 between sunrise and sunset at mid-month, calculated from the place latitude.
Is December a good time to visit?
December ranks 12 of 12 in our weather comparison; September ranks first.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 5391959
- NOAA station
- USW00023272 · SAN FRANCISCO DWTN
- Station distance
- 0.8 km from the place centre
- Coverage
- Strong coverage · 30 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for San Francisco is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
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