Weather in San Francisco in January 2025
- January is usually the coldest month of the year in San Francisco;
Average weather
Average temperature in San Francisco in January
Going from a maximum of +66°F during the day to a minimum of +39°F during the night, the temperature in January averages around +59°F.
The average maximum temperature goes down 13% by the end of the month, compared with the beginning of the month, from +61°F to +57°F.
Is San Francisco warm or cold in January?
San Francisco is typically mild in January.
Maximum temperatures go up compared to the previous month from +57°F to +57°F. The minimum temperature also goes up from +45°F to +45°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
January is the coldest month in San Francisco, here is the comparison with other months:
Water temperature in San Francisco in January
Water in San Francisco in January is Cold. It varies from +50°F to +56°F, with an average of +53°F. This is almost similar to the air temperature, which averages +57°F.
In January, water temperatures are average relative to the rest of the year:
Can you swim in San Francisco in January?
Climate in San Francisco in January
| December | January | February | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +57°F | +57°F | +61°F | ||||
| Min. temperature | ||||||
| +25°F | +30°F | +30°F | ||||
| Max. temperature | ||||||
| +73°F | +75°F | +75°F | ||||
| Rainfall | ||||||
| 117 mm | 113 mm | 108 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +54°F | +53°F | +53°F | ||||
| Humidity | ||||||
| 81% | 82% | 80% | ||||
| Air pressure | ||||||
| 1018 HPa | 1018 HPa | 1017 HPa | ||||
| Sunny days | ||||||
| 6 | 5 | 5 | ||||
| Cloudy days | ||||||
| 12 | 14 | 12 | ||||
| Rainy days | ||||||
| 12 | 13 | 11 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
January weather is still as ok as in December. The temperature levels stay the same in the area of +57°F for average maximum temperature during the day. As January arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 117 mm to 113 mm. Humidity rises from 81% to 82%. The average wind speed doesn’t change much during January, staying around 2 m/s. The days becoming less sunny, going from 6 sunny days in December to 5 in January.
February brings much the same weather, it remains ok.
Wind
The average wind speed is 1 m/s getting up to 3 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in San Francisco is gradually increasing during January, going from 1 m/s to 2 m/s over the course of the month.
Rain
How was the weather last January in San Francisco?
Climate Change Over the Years
The climate in San Francisco in January has not changed that much over the last 43 years.
The average temperature was the lowest in 1982 (+65°F) and the highest in 2014 (+70°F). The driest year was 2013 with only 127 mm of rainfall, and the wettest year was 1983 with 1162 mm.
FAQ
Is January a good time to visit San Francisco?
Can you sunbathe in San Francisco in January?
Can you swim in San Francisco in January?
Is San Francisco rainy in January?
Is it sunny in San Francisco in January?
Other cities in USA
Monthly weather in San Francisco
Source of the data
For this page, we’ve looked at the typical weather in San Francisco, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.