Planning a trip to San Diego in December? You are in luck! The weather is generally good, with an average maximum temperature of +64°F and approximately 10 sunny days. Just be prepared for some rain, as there are usually around 9 rainy days and 53 mm of precipitation. Expect good weather and pack accordingly to enjoy the outdoors. Search flightsin one click on Avionero.
Average weather
☀️
+64°F
Avg. max. temperature
+37°F
Min.
+81°F
Max.
53 mm
Total precipitation
67%
Avg. humidity
2 m/s
Avg. wind
10 ☀️
Sunny Days
12 ⛅️
Cloudy
9 🌦
Rainy
Our opinion: San Diego has good weather in December.
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Average temperature in San Diego in December
Here are the expected maximum, average and minimum temperatures in San Diego for December based on the historical data.
Last Year
Historical Data
Going from a maximum of +77°F during the day to a minimum of +45°F during the night, the temperature in December averages around +68°F.
The average maximum temperature goes down 11% by the end of the month, compared with the beginning of the month, from +64°F to +61°F.
Is San Diego warm or cold in December?
San Diego is typically mild in December.
Maximum temperatures go down compared to the previous month from +70°F to +64°F. The minimum temperature also goes down from +55°F to +50°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
December is one of the coolest months in San Diego, here is the comparison with other months:
Water temperature in San Diego in December
Water in San Diego in December is Cold. It varies from +58°F to +63°F, with an average of +61°F.This is almost similar to the air temperature, which averages +64°F.
In December, water temperatures are average relative to the rest of the year:
The warmest water temperatures in San Diego are reached in August, when the average sea temperature rises to +68°F. The coldest water temperatures are in February, with an average of +59°F.
Can you swim in San Diego in December?
We would not recommend swimming in San Diego in December, the water is very cold (+61°F on average). Consider swimming only if you are an experienced cold-water swimmer with proper gear.
🦭
Cold
Below +61°F
🏄♂️
Fresh
61°F - 70°F
🏊
Comfortable
70°F - 77°F
👙
Warm
77°F - 82°F
🔥
Very warm
+82°C and up
You will need a full-body wetsuit, cap, gloves, a warm change of clothes, and a hot drink ready for after your swim.
Climate in San Diego in December
San Diego weather looks like this, on average, in December and the surrounding months.
November
December
January
Avg. temperature
+70°F
+64°F
+64°F
Min. temperature
+41°F
+37°F
+37°F
Max. temperature
+95°F
+81°F
+86°F
Rainfall
34 mm
53 mm
69 mm
Wind
2 m/s
2 m/s
2 m/s
Avg. water temperature
+63°F
+61°F
+59°F
Humidity
67%
67%
68%
Air pressure
1016 HPa
1017 HPa
1018 HPa
Sunny days
9
10
8
Cloudy days
14
12
13
Rainy days
7
9
10
Snowy days
0
0
0
December weather is still as good as in November.It’s getting colder in December. From +70°F in the day, the average maximum temperature lowers to +64°F.Prepare for more rain. Average rainfall goes from 34 mm to 53 mm.Humidity levels don’t change as the month goes on, averaging around 67%.The average wind speed doesn’t change much during December, staying around 2 m/s.The good news is there are likely to be more sunny days in December, from 9 to 10.
January brings much the same weather, it remains good.
Wind speed in San Diego in December based on historical data.
Last Year
Historical Data
The average wind speed is 2 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in San Diego is gradually increasing during December, going from 2 m/s to 2 m/s over the course of the month.
Rain
Amount of rainfall in mm during December in San Diego based on historical data.
Last Year
Historical Data
Typically, there is a 39% chance of rain on an average day in December, with total rainfall of approximately 55 mm. The maximum amount of rainfall per day is around 24 mm, which is considered light rain.December is a pretty wet month with over 12 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
Here’s how December is compared with other months in the amount of precipitation, total mm:
San Diego wettest month is February, where a typical day has a 34% chance of precipitation and 84 mm of rainfall per day. July, on the other hand, is the driest month with a mere 6% chance of precipitation and 2 mm of rainfall per day.
How was the weather last December in San Diego?
This is the weather in San Diego in December 2023:
1 December
🌧️
+65°F
2 December
☀️
+66°F
3 December
☀️
+66°F
4 December
☁️
+70°F
5 December
☀️
+78°F
6 December
☀️
+74°F
7 December
🌫️
+65°F
8 December
☀️
+65°F
9 December
☀️
+72°F
10 December
☁️
+71°F
11 December
☁️
+68°F
12 December
🌫️
+65°F
13 December
☁️
+64°F
14 December
☀️
+70°F
15 December
☀️
+77°F
16 December
☁️
+75°F
17 December
☀️
+72°F
18 December
☁️
+73°F
19 December
☁️
+69°F
20 December
☁️
+67°F
21 December
☁️
+70°F
22 December
🌧️
+65°F
23 December
☁️
+64°F
24 December
🌧️
+66°F
25 December
☀️
+65°F
26 December
🌫️
+66°F
27 December
🌫️
+64°F
28 December
🌫️
+63°F
29 December
🌫️
+64°F
30 December
🌫️
+61°F
31 December
🌧️
+61°F
In December 2023 San Diego had 10 sunny days, 10 cloudy days, and 4 rainy days. The average maximum temperature was +68°F, with an absolute maximum of +77°F and a minimum of +61°F. The average humidity was 78%, with a maximum of 96% and a minimum of 29%. The average wind speed was 2 m/s, with a maximum of 7 m/s and a minimum of 0 m/s.
Are you planning a trip in December?
Climate Change Over the Years
This is how San Diego climate has changed over the last 43 years.
The climate in San Diego in December has not changed that much over the last 43 years.
The average temperature was the lowest in 2001 (+67°F) and the highest in 2014 (+74°F). The driest year was 2002 with only 156 mm of rainfall, and the wettest year was 2023 with 1311 mm.
FAQ
Frequently asked questions about the weather in San Diego in December:
Is December a good time to visit San Diego?
December is a really good time to go to San Diego. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit San Diego.
Can you sunbathe in San Diego in December?
December has mild temperatures in San Diego. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!
Can you swim in San Diego in December?
Swimming in San Diego in December is challenging and not recommended for inexperienced swimmers or without proper equipment and preparation.
Is San Diego rainy in December?
San Diego is often rainy in December. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in San Diego in December?
The amount of sunny days in San Diego during December varies; prepare for a mix of clouds and sun.
For this page, we’ve looked at the typical weather in San Diego, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
