Weather in San Diego, California for December 2025
Flood Watch - See hour by hour.
Until now, December 2025 in San Diego has been nearly identical to the historical average, with a temperature of 18.5 °F (showing only a slight deviation of 0.2 °F).
The forecast for the next days in San Diego predicts temperatures to be around 17 °F, close to the historical average.
In general, the average temperature in San Diego at the beginning of December is 17.9 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 16.7 °F by the end of December.
San Diego experiences moderate rainfall in December, with an average of 7 rainy days and a total precipitation of 16 mm.
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San Diego Weather December
Temperatures trend during December in San Diego
December weather in San Diego day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Dec. 1 |  Overcast | 19° /10° | 0 mm | 5 | |
| Dec. 2 |  Cloudy | 17° /9° | 0 mm | 4 | |
| Dec. 3 |  Sunny | 16° /10° | 0 mm | 4 | |
| Dec. 4 | Cloudy | 18° /9° | 0 mm | 4 | |
| Dec. 5 |  Partly cloudy | 19° /9° | 0 mm | 5 | |
| Dec. 6 | Partly cloudy | 19° /11° | 0 mm | 5 | |
| Dec. 7 | Partly cloudy | 17° /10° | 0 mm | 5 | |
| Dec. 8 | Partly cloudy | 17° /10° | 0 mm | 5 | |
| Dec. 9 | Partly cloudy | 20° /9° | 0 mm | 6 | |
| Dec. 10 | Sunny | 22° /11° | 0 mm | 6 | |
| Dec. 11 | Overcast | 19° /12° | 0 mm | 4 | |
| Dec. 12 | Cloudy | 16° /11° | 0 mm | 4 | |
| Dec. 13 | Sunny | 17° /12° | 0 mm | 4 | |
| 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° /12° | 0 mm | 4 | |
| Dec. 18 | Partly cloudy | 22° /12° | 0 mm | 6 | |
| Dec. 19 | Partly cloudy | 18° /12° | 0.6 mm | 5 | |
| Dec. 20 | Cloudy | 17° /12° | 1 mm | 4 | |
| Dec. 21 | Cloudy | 17° /12° | 0.6 mm | 3 | |
| Dec. 22 |  Patchy rain possible | 20° /14° | 0.2 mm | 0.6 | |
| Dec. 23 | Patchy rain possible | 17° /14° | 0.2 mm | 0.4 | |
| Dec. 24 |  Heavy rain | 20° /16° | 36.6 mm | 0.1 | |
| Dec. 25 |  Moderate rain | 18° /17° | 10.6 mm | 0.6 | |
| Dec. 26 | Patchy rain possible | 17° /15° | 4.3 mm | 0.5 | |
| Dec. 27 | Patchy rain possible | 15° /13° | 1.2 mm | 0 | |
| Dec. 28 | Sunny | 17° /13° | 0 mm | 4 | |
| Dec. 29 | Cloudy | 16° /14° | 0 mm | 3 | |
| Dec. 30 | Patchy rain possible | 16° /14° | 1.4 mm | 3 | |
| Dec. 31 | Patchy rain possible | 18° /15° | 1.2 mm | 4 | |
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San Diego in December - FAQ
December rainfall patterns in San Diego
UV exposure in San Diego during December
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