Sonoma County (Santa Rosa)
January
Weather in Sonoma County for January 2026
Your guide to Sonoma County weather in January - trends and predictions
In general, the average temperature in Sonoma County at the beginning of January is 13.1 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 13.7 °F by the end of January.
Sonoma County experiences moderate rainfall in January, with an average of 10 rainy days and a total precipitation of 141 mm.
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Temperatures
Rain 🌧️
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21
Dry days
10
Rainy days
0
Snow days
13°/5°
Temperatures
10 km/h
Avg max wind
78 %
Avg humidity
Sonoma County Weather January
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  13° | 2  14° | 3  11° | ||||
| 4  12° | 5  15° | 6  13° | 7 14° | 8 15° | 9  14° | 10 13° |
| 11 14° | 12 13° | 13  13° | 14 15° | 15 16° | 16 13° | 17 11° |
| 18 11° | 19 11° | 20 14° | 21 14° | 22 15° | 23 17° | 24 13° |
| 25 14° | 26 14° | 27 16° | 28 16° | 29 12° | 30 13° | 31 11° |
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Temperatures trend during January in Sonoma County
See the weather trend as well as the moving average line
January weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jan. 1 | Sunny | 13° /4° | 0 mm | 4 | |
| Jan. 2 | Overcast | 14° /7° | 9.4 mm | 3 | |
| Jan. 3 | Moderate or heavy rain with thunder | 11° /6° | 24.4 mm | 3 | |
| Jan. 4 | Partly cloudy | 12° /4° | 0 mm | 4 | |
| Jan. 5 | Mist | 15° /3° | 0 mm | 4 | |
| Jan. 6 | Light rain shower | 13° /6° | 3.2 mm | 3 | |
| Jan. 7 | Sunny | 14° /3° | 0 mm | 5 | |
| Jan. 8 | Overcast | 15° /4° | 0 mm | 4 | |
| Jan. 9 | Light drizzle | 14° /3° | 0.3 mm | 4 | |
| Jan. 10 | Light rain shower | 13° /4° | 0.7 mm | 4 | |
| Jan. 11 | Partly cloudy | 14° /3° | 0 mm | 5 | |
| Jan. 12 | Partly cloudy | 13° /3° | 0 mm | 4 | |
| Jan. 13 | Moderate rain | 13° /3° | 14.5 mm | 4 | |
| Jan. 14 | Patchy rain possible | 15° /6° | 0.1 mm | 4 | |
| Jan. 15 | Partly cloudy | 16° /3° | 0 mm | 4 | |
| Jan. 16 | Light rain | 13° /5° | 4.9 mm | 4 | |
| Jan. 17 | Mist | 11° /4° | 0 mm | 3 | |
| Jan. 18 | Partly cloudy | 11° /5° | 0 mm | 3 | |
| Jan. 19 | Light rain shower | 11° /5° | 7.4 mm | 3 | |
| Jan. 20 | Moderate or heavy rain with thunder | 14° /6° | 26.5 mm | 4 | |
| Jan. 21 | Light drizzle | 14° /5° | 0.9 mm | 4 | |
| Jan. 22 | Light rain shower | 15° /5° | 10.9 mm | 5 | |
| Jan. 23 | Mist | 17° /6° | 0 mm | 5 | |
| Jan. 24 | Moderate rain | 13° /6° | 2.6 mm | 4 | |
| Jan. 25 | Mist | 14° /5° | 0 mm | 4 | |
| Jan. 26 | Patchy rain possible | 14° /6° | 0 mm | 4 | |
| Jan. 27 | Patchy rain possible | 16° /5° | 0 mm | 4 | |
| Jan. 28 | Sunny | 16° /6° | 0 mm | 5 | |
| Jan. 29 | Sunny | 12° /6° | 0 mm | 4 | |
| Jan. 30 | Partly cloudy | 13° /7° | 0 mm | 4 | |
| Jan. 31 | Moderate rain | 11° /8° | 35 mm | 3 | |
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Important Notice
Our weather forecast for Sonoma County in January 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 January - FAQ
What are the expected maximum and minimum temperatures in Sonoma County during January?
During January, expect a variety of temperatures with highs around 13° and lows near 5°, suitable for diverse activities and preferences.
How much rainfall should be expected in Sonoma County during January?
Significant rainfall exceeding 141 mm is expected in Sonoma County during January, 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 January?
The average wind speed in Sonoma County during January is 10 km/h, suggesting breezy to windy conditions, depending on your activities.
January rainfall patterns in Sonoma County
Explore the daily rainfall trends and prepare for Sonoma Countys January weather 💧
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