Temperatures in December
It's cool to moderate in December in San Francisco with an average temperature of 15°C. Temperatures this month range from a low of 14°C to a high of 16°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 December. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of December
The month of December starts in San Francisco with cool temperatures, averaging around 16°C during the day and nights close to 10°C. A few showers might pop up in the first days of the month, but the weather remains mostly sunny and dry.
Mid-December
By mid-December, the average daytime temperature drops to around 15°C, with nights close to 9°C. There might be a few showers during this period, but plenty of dry days with sunshine too.
End of December
By the end of December, the average daytime temperature in San Francisco will be around 15°C, with nights close to 8°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days.
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Precipitation in December
In December, there is an average of 114 mm of precipitation, spread over 9 days. The wind speed is around 4 Bft, mostly coming from the South.
The average precipitation chance is 30% per day this month.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in December 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 December |
London | ||
|---|---|---|---|
 Average Temperature |
15°C | 9°C | |
 High Temp |
16°C | 11°C | |
| Low Temp |
14°C | 8°C | |
 Total Precipitation |
114 mm | 67 mm | |
| Rainy Days |
9 days | 10 days | |
November
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 December a good time to visit San Francisco?
Looking for sun and warm weather? Then December 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 December
With 24°C, San Francisco hit the highest temperature in the last 10 years in December 2020. The lowest daytime temperature in this month was 8°C in 2015. The extreme night temperatures ranged from a low of 0°C to a high of 16°C.
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Daily Temperature in December in San Francisco
This chart shows the average daily temperatures, both day and night, for each day in December 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 December in San Francisco
The chart below shows the average daily precipitation in December 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 December, you can expect around 9 days of rain in San Francisco.
Daily UV Index in December in San Francisco
This chart shows the average daily UV index in December 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 December in San Francisco Over the Years
This chart shows the average temperature in December in San Francisco, measured in degrees Celsius, over the past years.
Total Precipitation in December in San Francisco Over the Years
This chart shows the average precipitation in December 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 December for San Francisco
Click on a specific day in December 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 December in San Francisco
Have you been to San Francisco in December?
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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
