United StatesAverage weather for San Diego in December
It's pleasantly warm in December in San Diego with an average temperature of 19°C. Temperatures this month range from a low of 17°C to a high of 21°C. At night, you can expect temperatures between 9°C and 12°C.
Start of December
The month of December starts in San Diego with mild temps, averaging around 21°C during the day and nights around 12°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 20°C, with nights around 11°C. Not much precipitation expected during this period. It’s mostly dry and sunny.
End of December
By the end of December, the average daytime temperature in San Diego is around 19°C, while nighttime temps are about 11°C. A shower might pop up, but overall, the weather will be dry and sunny.
Water temperature
The water temperature at San Diego is 18°C this month. You can swim, but it's a bit chilly.
In December, there is an average of 54 mm of precipitation, spread over 5 days. The wind speed is around 3 Bft, mostly coming from the West.
San Diego in December |
New York | ||
|---|---|---|---|
 Average temperature |
19°C | 9°C | |
 Max. temperature |
21°C | 12°C | |
| Min. temperature |
17°C | -5°C | |
 Total precipitation |
54 mm | 133 mm | |
| Rainy days |
5 days | 17 days | |
November
UV index
The UV index is a maximum of 5 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 Diego?
Looking for great weather? December is a good time to be in San Diego. The temperatures are nice, and there’s not too much rain.
Temperature records
With 28°C in 2022, San Diego reached the highest temperature in December over the past 10 years. The lowest daytime temperature in this month was 12°C in 2014. The extreme nighttime temperatures ranged from a lowest recorded value of 4°C to a highest value of 17°C.
Check out the climate of San Diego for all months and discover the best travel time
Daily Temperature in December in San Diego
This chart shows the average daily high and low temperatures in December for San Diego, 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 Diego
The chart below shows the average daily precipitation in December for San Diego, 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 5 days of precipitation in San Diego.
Daily UV index in December in San Diego
This chart shows the average daily UV index in December in San Diego, 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 Diego over the years
This chart shows the average temperature in December in San Diego, measured in degrees Celsius, over the past few years.
Total precipitation in December in San Diego over the years
This chart shows the average precipitation in December in San Diego, 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 Diego
Click on any day in December to get detailed info about the usual weather on that day in San Diego. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in December in San Diego
Have you been to San Diego in December?
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Average weather in San Diego by month
Click on a month below to see detailed weather info for San Diego. 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 Diego for all months at once
