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United StatesThe weather in January in San Francisco
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.
Looking for sun and warm weather? January isn’t a good month to be in San Francisco. The temperatures are too low for a warm stay this month.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in January for San Francisco, California. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 24°C in 2021, San Francisco reached the highest temperature in January over the past 10 years. The lowest daytime temperature in this month was 9°C in 2017. The extreme nighttime temperatures ranged from a lowest recorded value of 1°C to a highest value of 14°C.
Rainfall amount
In January, there is an average of 82 mm of precipitation, spread over 12 days. The wind speed is around 4 Bft, mostly coming from the South.
Daily weather in January for San Francisco
Click on any day in January to get detailed info about the usual weather on that day in San Francisco. Check out the historical temperatures and precipitation over the past 10 years on this day.
January weather comparison
| San Francisco | New York | |
|---|---|---|
| Average temperature | 15°C | 5°C |
| Max. temperature | 17°C | 11°C |
| Min. temperature | 7°C | -5°C |
| Total precipitation | 82 mm | 97 mm |
| Rainy days | 12 days | 12 days |
Start of January
The month of January starts in San Francisco with cool temps, averaging around 15°C during the day and nights around 9°C.
Mid January
By mid-January, daytime temps rise to around 16°C, with nights around 10°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of January
By the end of January, the average daytime temperature in San Francisco is around 16°C, while nighttime temps are about 9°C. There’s hardly any chance of precipitation. The weather will be mostly dry with plenty of sun.
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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.
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Temperature charts
These charts show the average temperatures in January in San Francisco, California. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in January in San Francisco
Temperature in January in San Francisco over the years
Precipitation charts
These charts show the average amount of precipitation in January in San Francisco, California. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in January in San Francisco
Total precipitation in January in San Francisco over the years
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.
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.