Is San Francisco hot in December?
Days are typically warm at 29.4°C, while nights average 25.4°C.
Colombia · 1991–2020 normal
San Francisco in
December.
Typical December weather in San Francisco: 29.4°C by day, 25.4°C at night, 136 mm of rain over 14.9 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high29.4°C
Typical low25.4°C
Rain136 mm
Wet days14.9
In the year-round weather comparison, December scores 39 out of 100 (March leads the year at 61). Daylight is calculated as 11 h 24 from latitude 12.52°. Open-water sea temperature is 27.9°C (15 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 136 mm across about 15 wet days.
How much daylight is there?
There are about 11 h 24 between sunrise and sunset at mid-month, calculated from the place latitude.
Is December a good time to visit?
December ranks 5 of 12 in our weather comparison; March ranks first.
Event window
Warm sea in December
The nearest open-water NOAA OISST 1991–2020 cell averages 27.9°C in December. A sheltered bay can run warmer than that open-water cell.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 3669843
- NOAA station
- CO000080001 · SAN ANDRES (ISLA)/S
- Station distance
- 7.6 km from the place centre
- Coverage
- Good coverage · 21 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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