Sonoma County (Santa Rosa)
December
Weather in Sonoma County for December 2025
Your guide to Sonoma County weather in December - trends and predictions
In general, the average temperature in Sonoma County at the beginning of December is 15.3 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 13.4 °F by the end of December.
Sonoma County experiences moderate rainfall in December, with an average of 9 rainy days and a total precipitation of 141.3 mm.
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Temperatures
Rain 🌧️
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22
Dry days
9
Rainy days
0
Snow days
15°/7°
Temperatures
10 km/h
Avg max wind
77 %
Avg humidity
Sonoma County in December average weather
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  16° | 2  17° | 3 16° | 4 15° | 5 16° | 6  14° | |
| 7 13° | 8 14° | 9  16° | 10 15° | 11  17° | 12 14° | 13  14° |
| 14 14° | 15 12° | 16 15° | 17 15° | 18 13° | 19 14° | 20  13° |
| 21 14° | 22 16° | 23 15° | 24 13° | 25 13° | 26 15° | 27  14° |
| 28 14° | 29  14° | 30 13° | 31 11° |
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Temperatures trend during December in Sonoma 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 | 16° /6° | 0 mm | 4 | |
| Dec. 2 | Fog | 17° /8° | 0.1 mm | 5 | |
| Dec. 3 | Fog | 16° /7° | 0.2 mm | 4 | |
| Dec. 4 | Fog | 15° /7° | 0 mm | 4 | |
| Dec. 5 | Fog | 16° /8° | 0 mm | 4 | |
| Dec. 6 | Light rain shower | 14° /6° | 8 mm | 4 | |
| Dec. 7 | Light rain shower | 13° /6° | 1.7 mm | 3 | |
| Dec. 8 | Fog | 14° /3° | 0 mm | 4 | |
| Dec. 9 | Partly cloudy | 16° /1° | 0 mm | 5 | |
| Dec. 10 | Overcast | 15° /3° | 0 mm | 5 | |
| Dec. 11 | Sunny | 17° /4° | 0 mm | 5 | |
| Dec. 12 | Partly cloudy | 14° /8° | 25 mm | 4 | |
| Dec. 13 | Cloudy | 14° /6° | 0.7 mm | 4 | |
| Dec. 14 | Overcast | 14° /7° | 89.8 mm | 4 | |
| Dec. 15 | Sunny | 12° /3° | 0 mm | 4 | |
| Dec. 16 | Cloudy | 15° /5° | 15.3 mm | 4 | |
| Dec. 17 | Patchy rain possible | 15° /8° | 0.3 mm | 4 | |
| Dec. 18 | Light rain shower | 13° /7° | 8.4 mm | 3 | |
| Dec. 19 | Light rain shower | 14° /8° | 7.7 mm | 4 | |
| Dec. 20 | Moderate rain | 13° /8° | 25.6 mm | 3 | |
| Dec. 21 | Partly cloudy | 14° /9° | 9.3 mm | 4 | |
| Dec. 22 | Overcast | 16° /8° | 0 mm | 4 | |
| Dec. 23 | Partly cloudy | 15° /8° | 3.1 mm | 4 | |
| Dec. 24 | Overcast | 13° /6° | 30.3 mm | 3 | |
| Dec. 25 | Partly cloudy | 13° /5° | 0 mm | 5 | |
| Dec. 26 | Partly cloudy | 15° /8° | 15 mm | 4 | |
| Dec. 27 | Moderate or heavy rain with thunder | 14° /9° | 27.6 mm | 3 | |
| Dec. 28 | Mist | 14° /10° | 1.9 mm | 3 | |
| Dec. 29 | Moderate or heavy rain shower | 14° /8° | 37.1 mm | 4 | |
| Dec. 30 | Moderate or heavy rain with thunder | 13° /5° | 3.4 mm | 3 | |
| Dec. 31 | Light rain shower | 11° /3° | 0.7 mm | 3 | |
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Important Notice
Our weather forecast for Sonoma 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 Sonoma County forecast closer to your planned date for the most up-to-date weather information.
Sonoma County in December - FAQ
What are the expected maximum and minimum temperatures in Sonoma County during December?
During December, expect a variety of temperatures with highs around 15° and lows near 7°, suitable for diverse activities and preferences.
How much rainfall should be expected in Sonoma County during December?
Significant rainfall exceeding 141.3 mm is expected in Sonoma County during December, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Sonoma County during December?
The average wind speed in Sonoma County during December is 10 km/h, suggesting breezy to windy conditions, depending on your activities.
December rainfall patterns in Sonoma County
Explore the daily rainfall trends and prepare for Sonoma Countys December weather 💧
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