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San Francisco in January: weather, sea & travel advice
This month's data profile
Balanced monthly profile
San Francisco in January is climatically mixed. The average daily high is around 14 °C, and the sea is about 12 °C. With about 11 rainy days it is wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
37/100 · #11
Warmth
#12
Dryness
#11
Sun
#11
Sea warmth
#10
Published best categories: none
San Francisco · JanuaryPhoto: Dale Cruse · CC BY 2.0Climate facts
- Average high
- 14 °C
- Average low
- 6 °C
- Sea
- 12 °C
- Rainy days (est.)
- 11 rainy days (est.)
- Sun (est.)
- 3 h/day
- Humidity
- 84 %
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 |
|---|---|---|---|---|---|---|---|---|---|
| December | 14 | 7 | 12 | 130 | 2.5 | 82 | 2.2 | 12 | 36 |
| January (selected) | 14 | 6 | 11 | 117 | 2.8 | 84 | 2.1 | 12 | 37 |
| February | 14 | 7 | 10 | 113 | 4.1 | 83 | 2.3 | 12 | 43 |
How do the previous and next months compare?
Baseline: January (37/100)
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 | |
|---|---|---|---|---|---|---|---|---|---|
| December | -1 | ±0 °C | ±0 °C | +0.7 | +13.2 mm | -0.3 h | -2 % | +0.1 m/s | +0.4 °C |
| February | +6 | +0.9 °C | +0.7 °C | -0.7 | -4.2 mm | +1.3 h | -1.8 % | +0.1 m/s | +0.2 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is San Francisco in January?
The average daily high is around 14 °C, with an average daily low of about 6 °C.
Can you swim in San Francisco in January?
The sea is about 12 °C (cold).
Does it rain a lot in San Francisco in January?
The curated estimate is about 11 rainy days per month, not a directly measured long-term average. Total precipitation averages around 117 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. January is not among them.