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United States weather

Weather in Sonoma County, California for December 2026

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

    Temperatures

  • In general, the average temperature in Sonoma County at the beginning of December is 15.3 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 12.9 °C by the end of December.

    • Rain 🌧️

  • Sonoma County experiences moderate rainfall in December, with an average of 10 rainy days and a total precipitation of 371.5 mm.

    • More

  • Is December a good time to visit Sonoma County? check out the best time to travel to Sonoma County page.

  • ✨ Is December a good time to visit Sonoma County? – Ask the AI Weatherman

Average dry days
21
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
14°/7°
Temperatures
Average wind speed
11 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
16°
3
Fog
16°
4
Fog
16°
5
Fog
15°
6
Light rain
15°
7
Light rain shower
13°
8
Mist
14°
9
Mist
15°
10
Overcast
16°
11
Sunny
17°
12
Moderate rain
16°
13
Cloudy
16°
14
Heavy rain
14°
15
Sunny
13°
16
Moderate rain
16°
17
Patchy rain possible
15°
18
Light rain
12°
19
Moderate rain
14°
20
Heavy rain
12°
21
Heavy rain
14°
22
Light rain
15°
23
Moderate rain
14°
24
Heavy rain
13°
25
Heavy rain
12°
26
Moderate rain
14°
27
Moderate or heavy rain with thunder
13°
28
Patchy rain possible
13°
29
Moderate rain
14°
30
Moderate or heavy rain with thunder
13°
31
Moderate rain
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 2.2
Dec. 2 Fog
Fog
 16° /7° 0.1 mm 2.2
Dec. 3 Fog
Fog
 16° /7° 0.1 mm 2.2
Dec. 4 Fog
Fog
 16° /6° 0 mm 2.2
Dec. 5 Fog
Fog
 15° /7° 0 mm 2.2
Dec. 6 Light rain
Light rain
 15° /7° 5.3 mm 2.1
Dec. 7 Light rain shower
Light rain shower
 13° /6° 1.1 mm 2.1
Dec. 8 Mist
Mist
 14° /5° 0 mm 2.1
Dec. 9 Mist
Mist
 15° /3° 0 mm 2.1
Dec. 10 Overcast
Overcast
 16° /4° 0 mm 2.1
Dec. 11 Sunny
Sunny
 17° /4° 0 mm 2.1
Dec. 12 Moderate rain
Moderate rain
 16° /7° 16.6 mm 2.1
Dec. 13 Cloudy
Cloudy
 16° /7° 0.5 mm 2.1
Dec. 14 Heavy rain
Heavy rain
 14° /6° 59.9 mm 2
Dec. 15 Sunny
Sunny
 13° /4° 0 mm 2
Dec. 16 Moderate rain
Moderate rain
 16° /7° 10.2 mm 2
Dec. 17 Patchy rain possible
Patchy rain possible
 15° /9° 1.5 mm 2
Dec. 18 Light rain
Light rain
 12° /7° 5.6 mm 2
Dec. 19 Moderate rain
Moderate rain
 14° /9° 12.1 mm 2
Dec. 20 Heavy rain
Heavy rain
 12° /9° 25.9 mm 2
Dec. 21 Heavy rain
Heavy rain
 14° /10° 67 mm 2
Dec. 22 Light rain
Light rain
 15° /9° 4 mm 2
Dec. 23 Moderate rain
Moderate rain
 14° /9° 15.9 mm 2
Dec. 24 Heavy rain
Heavy rain
 13° /8° 33.4 mm 2
Dec. 25 Heavy rain
Heavy rain
 12° /7° 32.5 mm 2
Dec. 26 Moderate rain
Moderate rain
 14° /9° 21.5 mm 2
Dec. 27 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 13° /8° 18.4 mm 2
Dec. 28 Patchy rain possible
Patchy rain possible
 13° /7° 1.2 mm 2
Dec. 29 Moderate rain
Moderate rain
 14° /6° 24.7 mm 2.1
Dec. 30 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 13° /5° 2.3 mm 2
Dec. 31 Moderate rain
Moderate rain
 11° /5° 11.5 mm 2
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 371.5 mm is expected in Sonoma County during December, occurring over more than 10 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 11 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 10 rainy days in December with a total of 371.5 mm of rainfall.
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Santa Rosa
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