Hottest (avg)
#12 / 12
San Francisco in December
December weather, climate averages, and packing tips.
Avg High
Avg Low
Rain
Daylight 10h
What to expect
As winter continues, December brings, where temperatures are dropping quickly. Daytime highs average 13°C / 56°F, dropping to 7°C / 44°F at night.
The atmosphere is generally mild but frequently damp, typical of changeable seasons.
Statistically, this is the wettest time of year.
December in context
How it compares to the rest of the year in San Francisco.
Wettest (avg)
#1 / 12
Daylight Hours
#12 / 12
Windiest (avg)
#9 / 12
Highest UV
#12 / 12
Most Humid
#2 / 12
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight
- 9.6 hours
- UV index (max)
- 3
- Typical sun hours
- 07:17 – 16:52
Rain & Snow
- Total
-
- Rainy days
- 12
- Cloud cover
- 60%
- Snowfall
-
Humidity & Wind
- Humidity (avg)
- 81%
- Wind (avg)
-
- Wind (max gusts)
-
Frequently asked questions
Is December a good time to visit San Francisco?
Typical December days in San Francisco reach highs of 13°C (55°F) with nights around 7°C (45°F). It usually feels cool by day and cold after dark. It is among the wetter months, so it is wise to have some indoor backup plans or flexible activities.
What are temperatures like in December?
In December, you can usually expect highs of 13°C (55°F) and lows near 7°C (45°F). That means cool days and cold nights, so pack layers you can add or remove.
How much does it rain in December?
Rainfall in December averages 137 mm (5.4 in) across roughly 12 days. Overall it is a quite rainy time of year, so a light rain jacket and waterproof shoes are very handy.
How many hours of daylight are there in December?
You can expect about 10 hours of daylight in December. Sunrise is typically around 07:17 and sunset near 16:52. Days are on the shorter side, so plan activities around limited daylight.
How strong is the sun in December?
UV levels are moderate (around 3); sunscreen and sunglasses are still a good idea.
Is it windy in December?
In December, average wind speeds are around 13 km/h (8 mph), with gusts on the windiest days reaching about 61 km/h (38 mph). On the ground, it is it is a notably windy place, and strong gusts are fairly common.