United StatesAverage weather for San Francisco 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.
Start of December
The month of December starts in San Francisco with cool temps, averaging around 16°C during the day and nights around 10°C. A few showers might pop up early in the month, but overall, it’ll stay mostly sunny and dry.
Mid December
By mid-December, daytime temps drop to around 15°C, with nights around 9°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of December
By the end of December, the average daytime temperature in San Francisco is around 15°C, while nighttime temps are about 8°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
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.
San Francisco in December |
New York | ||
|---|---|---|---|
 Average temperature |
15°C | 9°C | |
 Max. temperature |
16°C | 12°C | |
| Min. temperature |
14°C | -5°C | |
 Total precipitation |
114 mm | 133 mm | |
| Rainy days |
9 days | 17 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? December isn’t a good month to be in San Francisco. The temperatures are too low for a warm stay this month.
Temperature records
With 24°C in 2020, San Francisco reached the highest temperature in December over the past 10 years. The lowest daytime temperature in this month was 8°C in 2015. The extreme nighttime temperatures ranged from a lowest recorded value of 0°C to a highest value of 16°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 high and low temperatures in December for San Francisco, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in December in San Francisco
The chart below shows the average daily precipitation in December for San Francisco, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed 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 it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for December, you can expect about 9 days of precipitation 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 few years.
Total precipitation in December in San Francisco over the years
This chart shows the average precipitation in December in San Francisco, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
Daily weather in December for San Francisco
Click on any day in December 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.
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
