San Diego County (San Diego)
December
Weather in San Diego County for December 2025
Your guide to San Diego County weather in December - trends and predictions
In general, the average temperature in San Diego County at the beginning of December is 17.6 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 16.7 °F by the end of December.
San Diego County experiences moderate rainfall in December, with an average of 8 rainy days and a total precipitation of 25.6 mm.
Christmas Day weather in San Diego County 🎄 - See the complete forecast for Wednesday, December 25.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
23
Dry days
8
Rainy days
0
Snow days
18°/13°
Temperatures
13 km/h
Avg max wind
59 %
Avg humidity
San Diego County in December average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  17° | 2 17° | 3  17° | 4 17° | 5  18° | 6 20° | 7 17° |
| 8 16° | 9 18° | 10 23° | 11 19° | 12 15° | 13 17° | 14 18° |
| 15 18° | 16 19° | 17 18° | 18 22° | 19  17° | 20  17° | 21 17° |
| 22  17° | 23 17° | 24 18° | 25 19° | 26 19° | 27 16° | 28 17° |
| 29 16° | 30 15° | 31 15° |
You can click on date
Access San Diego County weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during December in San Diego County
See the weather trend as well as the moving average line
December weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Dec. 1 | Overcast | 17° /11° | 0 mm | 5 | |
| Dec. 2 | Overcast | 17° /9° | 0 mm | 4 | |
| Dec. 3 | Sunny | 17° /9° | 0 mm | 4 | |
| Dec. 4 | Overcast | 17° /10° | 0 mm | 4 | |
| Dec. 5 | Partly cloudy | 18° /11° | 0 mm | 5 | |
| Dec. 6 | Partly cloudy | 20° /11° | 0 mm | 6 | |
| Dec. 7 | Overcast | 17° /10° | 0 mm | 5 | |
| Dec. 8 | Sunny | 16° /9° | 0 mm | 5 | |
| Dec. 9 | Partly cloudy | 18° /9° | 0 mm | 6 | |
| Dec. 10 | Sunny | 23° /11° | 0 mm | 6 | |
| Dec. 11 | Overcast | 19° /13° | 0 mm | 4 | |
| Dec. 12 | Sunny | 15° /12° | 0 mm | 4 | |
| Dec. 13 | Sunny | 17° /12° | 0 mm | 5 | |
| Dec. 14 | Partly cloudy | 18° /12° | 0 mm | 5 | |
| Dec. 15 | Sunny | 18° /12° | 0 mm | 5 | |
| Dec. 16 | Sunny | 19° /11° | 0 mm | 5 | |
| Dec. 17 | Overcast | 18° /13° | 0 mm | 4 | |
| Dec. 18 | Partly cloudy | 22° /13° | 0 mm | 6 | |
| Dec. 19 | Patchy rain possible | 17° /12° | 0.9 mm | 5 | |
| Dec. 20 | Patchy light drizzle | 17° /12° | 1.5 mm | 4 | |
| Dec. 21 | Patchy rain possible | 17° /12° | 0.9 mm | 4 | |
| Dec. 22 | Cloudy | 17° /11° | 5.1 mm | 4 | |
| Dec. 23 | Sunny | 17° /12° | 0 mm | 5 | |
| Dec. 24 | Sunny | 18° /12° | 0.1 mm | 4 | |
| Dec. 25 | Partly cloudy | 19° /12° | 0 mm | 5 | |
| Dec. 26 | Cloudy | 19° /12° | 0 mm | 5 | |
| Dec. 27 | Cloudy | 16° /12° | 1 mm | 4 | |
| Dec. 28 | Patchy rain possible | 17° /12° | 3 mm | 4 | |
| Dec. 29 | Overcast | 16° /12° | 0 mm | 4 | |
| Dec. 30 | Patchy rain possible | 15° /12° | 1.8 mm | 4 | |
| Dec. 31 | Patchy rain possible | 15° /12° | 1.6 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for San Diego County in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the San Diego County forecast closer to your planned date for the most up-to-date weather information.
San Diego County in December - FAQ
What are the expected maximum and minimum temperatures in San Diego County during December?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Diego County during December?
In December, San Diego County can expect light to moderate rainfall, totaling 25.6 mm across approximately 8 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in San Diego County during December?
The average wind speed in San Diego County during December is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
December rainfall patterns in San Diego County
Explore the daily rainfall trends and prepare for San Diego Countys December weather 💧
UV exposure in San Diego County during December
Stay informed about UV levels for safe outdoor activities throughout the month of December ☀️
Top locations in San Diego County
Select a location for an accurate weather forecast
More Locations Quick links
You are here
Where is San Diego County?Get accurate weather forecasts for San Diego County, located at latitude 32.716 and longitude -117.165. Stay updated with localized weather information tailored for San Diego County.
Found a mistake?
We appreciate your attention to details. Tell us here.