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San Francisco in December: weather, sea & travel advice
This month's data profile
Rain shapes the decision
San Francisco in December is climatically mixed. The average daily high is around 14 °C, and the sea is about 12 °C. With about 12 rainy days it is wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
36/100 · #12
Warmth
#11
Dryness
#12
Sun
#12
Sea warmth
#7
Published best categories: none
San Francisco · DecemberPhoto: Dale Cruse · CC BY 2.0Climate facts
- Average high
- 14 °C
- Average low
- 7 °C
- Sea
- 12 °C
- Rainy days (est.)
- 12 rainy days (est.)
- Sun (est.)
- 3 h/day
- Humidity
- 82 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| November | 17 | 9 | 7 | 65 | 3.5 | 77 | 2.0 | 13 | 55 |
| December (selected) | 14 | 7 | 12 | 130 | 2.5 | 82 | 2.2 | 12 | 36 |
| January | 14 | 6 | 11 | 117 | 2.8 | 84 | 2.1 | 12 | 37 |
How do the previous and next months compare?
Baseline: December (36/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| November | +19 | +3.7 °C | +2.2 °C | -4.3 | -65.5 mm | +1 h | -5.6 % | -0.3 m/s | +0.9 °C |
| January | +1 | ±0 °C | ±0 °C | -0.7 | -13.2 mm | +0.3 h | +2 % | -0.1 m/s | -0.4 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is San Francisco in December?
The average daily high is around 14 °C, with an average daily low of about 7 °C.
Can you swim in San Francisco in December?
The sea is about 12 °C (cold).
Does it rain a lot in San Francisco in December?
The curated estimate is about 12 rainy days per month, not a directly measured long-term average. Total precipitation averages around 130 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit San Francisco?
By the climate score, July, August, September and October are the strongest months for San Francisco. For a beach trip: July, August and September. December is not among them.