Weather in San Francisco, California for December 2025
Flood Watch - See hour by hour.
Until now, December 2025 in San Francisco is slightly cooler than the historical average by -0.6 °F.
The forecast for the next days in San Francisco predicts temperatures to be around 13 °F, close to the historical average.
In general, the average temperature in San Francisco at the beginning of December is 13.9 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 11.7 °F by the end of December.
San Francisco experiences heavy rainfall in December, with over 20 rainy days and an average total precipitation 156.8 mm.
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San Francisco Weather December
Temperatures trend during December in San Francisco
December weather in San Francisco day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Dec. 1 |  Cloudy | 16° /8° | 4 mm | 4 | |
| Dec. 2 |  Sunny | 14° /8° | 0.1 mm | 4 | |
| Dec. 3 |  Fog | 13° /8° | 2.6 mm | 4 | |
| Dec. 4 | Sunny | 14° /9° | 0.4 mm | 4 | |
| Dec. 5 | Fog | 14° /9° | 0.9 mm | 4 | |
| Dec. 6 | Fog | 13° /9° | 2.6 mm | 3 | |
| Dec. 7 | Fog | 13° /8° | 0.9 mm | 3 | |
| Dec. 8 |  Overcast | 12° /7° | 0.6 mm | 3 | |
| Dec. 9 | Overcast | 13° /7° | 0 mm | 3 | |
| Dec. 10 | Sunny | 13° /7° | 6.3 mm | 3 | |
| Dec. 11 | Overcast | 13° /8° | 2.6 mm | 3 | |
| Dec. 12 | Overcast | 14° /8° | 8.5 mm | 4 | |
| Dec. 13 | Overcast | 13° /8° | 8.3 mm | 3 | |
| Dec. 14 | Sunny | 12° /7° | 17.6 mm | 4 | |
| Dec. 15 | Fog | 12° /6° | 1.3 mm | 3 | |
| Dec. 16 | Overcast | 14° /7° | 2.6 mm | 4 | |
| Dec. 17 |  Partly cloudy | 13° /8° | 1.6 mm | 4 | |
| Dec. 18 | Sunny | 13° /7° | 3.1 mm | 4 | |
| Dec. 19 |  Moderate rain | 16° /11° | 5.8 mm | 0.3 | |
| Dec. 20 |  Heavy rain | 13° /12° | 61.9 mm | 0.3 | |
| Dec. 21 | Heavy rain | 14° /13° | 142 mm | 0.1 | |
| Dec. 22 | Heavy rain | 13° /10° | 102 mm | 0.2 | |
| Dec. 23 | Moderate rain | 15° /10° | 12.1 mm | 0.2 | |
| Dec. 24 | Moderate rain | 14° /12° | 11.1 mm | 0 | |
| Dec. 25 |  Patchy rain possible | 12° /11° | 4.4 mm | 3 | |
| Dec. 26 | Patchy rain possible | 12° /10° | 3.6 mm | 3 | |
| Dec. 27 | Patchy rain possible | 12° /9° | 1.2 mm | 3 | |
| Dec. 28 | Partly cloudy | 12° /8° | 0 mm | 3 | |
| Dec. 29 | Sunny | 11° /8° | 0 mm | 3 | |
| Dec. 30 | Overcast | 10° /9° | 0 mm | 2 | |
| Dec. 31 | Sunny | 13° /8° | 0 mm | 4 | |
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San Francisco in December - FAQ
December rainfall patterns in San Francisco
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