Temperatures in December
It's hot in December in San Francisco with an average temperature of 31°C. Temperatures this month range from a low of 30°C to a high of 31°C. At night, you can expect temperatures between 17°C and 20°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 hot temperatures, averaging around 31°C during the day and nights close to 20°C. There’s little chance of precipitation. The weather is mostly sunny and dry.
Since temperatures can differ between day and night, it’s a good idea to dress in layers.
Mid-December
By mid-December, the average daytime temperature stays the same at 31°C, with nights close to 19°C. Not much precipitation expected during this period. It’s mostly dry with sunshine.
Temperatures vary between day and night, so it’s smart to wear layers.
End of December
By the end of December, the average daytime temperature in San Francisco will be around 31°C, with nights close to 18°C. No precipitation expected, with plenty of sunshine on the horizon.
As it gets cooler in the evening, it’s best to wear layers.
Precipitation in December
According to weather history, there is only 8 mm of precipitation in December. The wind speed is around 3 Bft, mostly coming from the Southeast.
The average chance of precipitation is only 5% in December.
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 |
31°C | 9°C | |
 High Temp |
31°C | 11°C | |
| Low Temp |
30°C | 8°C | |
 Total Precipitation |
8 mm | 67 mm | |
| Rainy Days |
1 day | 10 days | |
November
UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is December a good time to visit San Francisco?
December is a fantastic month to be in San Francisco for sunny weather. You’ll get high temperatures and little chance of rain this month.
The hurricane season in San Francisco runs from June to November.
Temperature records for San Francisco in December
With 34°C, San Francisco hit the highest temperature in the last 10 years in December 2019. The lowest daytime temperature in this month was 24°C in 2023. The extreme night temperatures ranged from a low of 11°C to a high of 23°C.
Check out the climate of San Francisco for all months and discover the best travel time
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 about 1 day 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?
Share your weather experience in December in San Francisco.
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
