Temperatures in January
It's cool to moderate in January in San Francisco with an average temperature of 15°C. Temperatures this month range from a low of 13°C to a high of 17°C. At night, you can expect temperatures between 7°C and 10°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for San Francisco in January. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of January
The month of January starts in San Francisco with cool temperatures, averaging around 15°C during the day and nights close to 9°C. You can expect regular precipitation, but there’s also a chance for some sunny days in the first days of the month.
Mid-January
By mid-January, the average daytime temperature rises to around 16°C, with nights close to 10°C. There might be a few showers during this period, but plenty of dry days with sunshine too.
End of January
By the end of January, the average daytime temperature in San Francisco will be around 16°C, with nights close to 9°C. Barely any chance of precipitation. The weather will mostly be dry with lots of sunshine.
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Precipitation in January
In January, there is an average of 82 mm of precipitation, spread over 8 days. The wind speed is around 4 Bft, mostly coming from the South.
The average precipitation chance is 25% per day this month. Though it seems pretty low, the weather’s variable. Some days have higher and others lower precipitation chances, which lowers the average.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in January for San Francisco. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
San Francisco in January |
London | ||
|---|---|---|---|
 Average Temperature |
15°C | 8°C | |
 High Temp |
17°C | 9°C | |
| Low Temp |
13°C | 6°C | |
 Total Precipitation |
82 mm | 58 mm | |
| Rainy Days |
8 days | 9 days | |
December
UV index
The UV index is a maximum of 4 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Is January a good time to visit San Francisco?
Looking for sun and warm weather? Then January isn’t the best time to be in San Francisco. The temperature is too low this month for a warm stay.
Temperature records for San Francisco in January
With 24°C, San Francisco hit the highest temperature in the last 10 years in January 2021. The lowest daytime temperature in this month was 9°C in 2017. The extreme night temperatures ranged from a low of 1°C to a high of 14°C.
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Daily Temperature in January in San Francisco
This chart shows the average daily temperatures, both day and night, for each day in January in San Francisco, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in January in San Francisco
The chart below shows the average daily precipitation in January for San Francisco, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for January, you can expect around 8 days of rain in San Francisco.
Daily UV Index in January in San Francisco
This chart shows the average daily UV index in January in San Francisco, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in January in San Francisco Over the Years
This chart shows the average temperature in January in San Francisco, measured in degrees Celsius, over the past years.
Total Precipitation in January in San Francisco Over the Years
This chart shows the average precipitation in January in San Francisco, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in January for San Francisco
Click on a specific day in January for detailed info on the typical weather on that day in San Francisco. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in January in San Francisco
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Average Weather in San Francisco by Month
Click on a month below to see detailed weather info for San Francisco. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of San Francisco for all months at once
