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 7 rainy days and a total precipitation of 16 mm.
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Temperatures
Rain 🌧️
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24
Dry days
7
Rainy days
0
Snow days
17°/12°
Temperatures
13 km/h
Avg max wind
62 %
Avg humidity
San Diego County Weather December
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 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° |
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Temperatures trend during December in San Diego County
See the weather trend as well as the moving average line
December weather day by day
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| 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 | |
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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 17° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Diego County during December?
Expect minimal rainfall in San Diego County during December, with a total of 16 mm over approximately 7 days. This minimal precipitation is unlikely to significantly impact plans.
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 ☀️
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