Weather in San Diego in December 2024
Average weather
Average temperature in San Diego in December
The temperature in December is +20°C on average, with a range between a maximum of +25°C during the day and a minimum of +7°C at night.
The average maximum temperature goes down 11% by the end of the month, compared with the beginning of the month, from +18°C to +16°C.
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 +21°C to +18°C. The minimum temperature also goes down from +13°C to +10°C.
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 +15°C to +17°C, with an average of +16°C. This is almost similar to the air temperature, which averages +18°C.
In December, water temperatures are average relative to the rest of the year:
Can you swim in San Diego in December?
Climate in San Diego in December
| November | December | January | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +21°C | +18°C | +18°C | ||||
| Min. temperature | ||||||
| +5°C | +3°C | +3°C | ||||
| Max. temperature | ||||||
| +35°C | +27°C | +30°C | ||||
| Rainfall | ||||||
| 34 mm | 53 mm | 69 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Avg. water temperature | ||||||
| +17°C | +16°C | +15°C | ||||
| 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 +21°C in the day, the average maximum temperature lowers to +18°C. 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
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
How was the weather last December in San Diego?
Climate Change over Years
The climate in San Diego in December has not changed much over the last 43 years.
The average temperature was the lowest in 2001 (+19°C) and the highest in 2014 (+23°C). The driest year was 2002 with only 156 mm of rainfall, and the wettest year was 2023 with 1311 mm.
FAQ
Is December a good time to visit San Diego?
Can you sunbathe in San Diego in December?
Can you swim in San Diego in December?
Is San Diego rainy in December?
Is it sunny in San Diego in December?
Other cities in USA
Monthly weather in San Diego
Source of the data
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.