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Weather in Sonoma County, California for December 2025

Your guide to Sonoma County weather in December - trends and predictions

    Temperatures

  • So far, December 2025 in Sonoma County is slightly warmer than the historical average by 0.8 °F.

  • Expect cooler weather in the next days in Sonoma County with the forecast suggesting a temperature of 13.1 °F, lower than the historical average.

  • In general, the average temperature in Sonoma County at the beginning of December is 15.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 11.4 °F by the end of December.

    • Rain 🌧️

  • Sonoma County in December brings notable rainfall, with an average of 16 rainy days and a total precipitation of 311.3 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
15
Dry days
Average rainy days
16
Rainy days
Average snowy days
0
Snow days
Average temperatures
14°/7°
Temperatures
Average wind speed
10 km/h
Avg max wind
Average humidity
82 %
Avg humidity

Sonoma County Weather December

Move between months or click on a day
November
January
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
16°
2
Fog
17°
3
Fog
16°
4
Fog
16°
5
Fog
16°
6
Light rain shower
15°
7
Light rain shower
14°
8
Mist
14°
9
Mist
15°
10
Overcast
16°
11
Sunny
17°
12
Partly cloudy
16°
13
Cloudy
16°
14
Overcast
14°
15
Sunny
13°
16
Cloudy
16°
17
Patchy rain possible
18°
18
Overcast
13°
19
Overcast
13°
20
Moderate rain
16°
21
Moderate rain
15°
22
Patchy rain possible
14°
23
Moderate rain
13°
24
Sunny
13°
25
Overcast
11°
26
Patchy rain possible
11°
27
Patchy rain possible
11°
28
Partly cloudy
13°
29
Patchy rain possible
12°
30
Moderate rain
11°
31
Light rain shower
11°

Temperatures trend during December in Sonoma County

See the weather trend as well as the moving average line

December weather in Sonoma County day by day

Click on a date for more information
November January
Date Weather Temperatures Rain UV More
Dec. 1 Overcast
Overcast
 16° /4° 0 mm 4
Dec. 2 Fog
Fog
 17° /7° 0.1 mm 4
Dec. 3 Fog
Fog
 16° /6° 0.1 mm 4
Dec. 4 Fog
Fog
 16° /6° 0 mm 4
Dec. 5 Fog
Fog
 16° /7° 0 mm 4
Dec. 6 Light rain shower
Light rain shower
 15° /7° 5.3 mm 4
Dec. 7 Light rain shower
Light rain shower
 14° /5° 1.1 mm 4
Dec. 8 Mist
Mist
 14° /4° 0 mm 3
Dec. 9 Mist
Mist
 15° /2° 0 mm 4
Dec. 10 Overcast
Overcast
 16° /3° 0 mm 4
Dec. 11 Sunny
Sunny
 17° /4° 0 mm 4
Dec. 12 Partly cloudy
Partly cloudy
 16° /6° 16.6 mm 5
Dec. 13 Cloudy
Cloudy
 16° /6° 0.5 mm 4
Dec. 14 Overcast
Overcast
 14° /6° 59.9 mm 3
Dec. 15 Sunny
Sunny
 13° /4° 0 mm 4
Dec. 16 Cloudy
Cloudy
 16° /7° 10.2 mm 4
Dec. 17 Patchy rain possible
Patchy rain possible
 18° /8° 3.3 mm 0.3
Dec. 18 Overcast
Overcast
 13° /6° 0 mm 0.4
Dec. 19 Overcast
Overcast
 13° /9° 0 mm 0.1
Dec. 20 Moderate rain
Moderate rain
 16° /12° 15 mm 0.2
Dec. 21 Moderate rain
Moderate rain
 15° /13° 11.2 mm 0
Dec. 22 Patchy rain possible
Patchy rain possible
 14° /12° 1.9 mm 3
Dec. 23 Moderate rain
Moderate rain
 13° /8° 7.9 mm 3
Dec. 24 Sunny
Sunny
 13° /6° 0 mm 3
Dec. 25 Overcast
Overcast
 11° /5° 0 mm 2
Dec. 26 Patchy rain possible
Patchy rain possible
 11° /7° 0.2 mm 2
Dec. 27 Patchy rain possible
Patchy rain possible
 11° /8° 0.3 mm 2
Dec. 28 Partly cloudy
Partly cloudy
 13° /6° 0 mm 3
Dec. 29 Patchy rain possible
Patchy rain possible
 12° /6° 2.7 mm 2
Dec. 30 Moderate rain
Moderate rain
 11° /10° 6.3 mm 3
Dec. 31 Light rain shower
Light rain shower
 11° /3° 0.7 mm 3
Next
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.
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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 14° and lows near 7°, suitable for diverse activities and preferences.
How much rainfall should be expected in Sonoma County during December?
Significant rainfall exceeding 311.3 mm is expected in Sonoma County during December, occurring over more than 16 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 💧
Typically, Sonoma County has 16 rainy days in December with a total of 311.3 mm of rainfall.
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Santa Rosa
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Location coordinates Where is Sonoma County?

Get accurate weather forecasts for Sonoma County, located at latitude 38.44 and longitude -122.714. Stay updated with localized weather information tailored for Sonoma County.

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