Sonoma County (Santa Rosa)
January
Weather in Sonoma County, California for January 2027
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 12.8 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 14 °C by the end of January.
Sonoma County experiences moderate rainfall in January, with an average of 6 rainy days and a total precipitation of 154 mm.
Is January a good time to visit Sonoma County? check out the best time to travel to Sonoma County page.
✨ Is January a good time to visit Sonoma County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
25
Dry days
6
Rainy days
0
Snow days
14°/5°
Temperatures
10 km/h
Avg max wind
79 %
Avg humidity
Sonoma County Weather January
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Temperatures trend during January in Sonoma County
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January weather in Sonoma County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jan. 1 |  Moderate rain | 13° /6° | 15.8 mm | 2.1 | |
| Jan. 2 |  Light rain | 13° /8° | 9.6 mm | 2 | |
| Jan. 3 |  Moderate or heavy rain with thunder | 12° /8° | 40.1 mm | 2 | |
| Jan. 4 | Moderate rain | 12° /6° | 15.6 mm | 2.1 | |
| Jan. 5 |  Mist | 14° /5° | 0 mm | 2 | |
| Jan. 6 |  Light rain shower | 13° /7° | 2.1 mm | 2 | |
| Jan. 7 |  Sunny | 13° /5° | 0 mm | 2.2 | |
| Jan. 8 |  Overcast | 14° /4° | 0 mm | 2.2 | |
| Jan. 9 | Light drizzle | 14° /3° | 0.2 mm | 2.2 | |
| Jan. 10 | Light rain shower | 13° /3° | 0.5 mm | 2.3 | |
| Jan. 11 |  Partly cloudy | 15° /3° | 0 mm | 2.3 | |
| Jan. 12 | Partly cloudy | 12° /3° | 0 mm | 2.3 | |
| Jan. 13 | Moderate rain | 15° /3° | 9.6 mm | 2.3 | |
| Jan. 14 | Patchy rain possible | 15° /5° | 0.1 mm | 2.4 | |
| Jan. 15 | Partly cloudy | 17° /4° | 0 mm | 2.4 | |
| Jan. 16 | Light rain | 15° /6° | 3.2 mm | 2.4 | |
| Jan. 17 | Mist | 13° /4° | 0 mm | 2 | |
| Jan. 18 | Partly cloudy | 14° /5° | 0 mm | 2 | |
| Jan. 19 | Light rain | 13° /5° | 4.9 mm | 2 | |
| Jan. 20 | Moderate or heavy rain with thunder | 15° /5° | 17.7 mm | 2 | |
| Jan. 21 | Light drizzle | 14° /6° | 0.6 mm | 2.6 | |
| Jan. 22 | Light rain | 14° /6° | 7.3 mm | 2.6 | |
| Jan. 23 | Mist | 14° /6° | 0 mm | 2.7 | |
| Jan. 24 | Patchy rain possible | 14° /4° | 1.8 mm | 2.7 | |
| Jan. 25 | Mist | 13° /4° | 0 mm | 2.7 | |
| Jan. 26 | Patchy rain possible | 14° /6° | 0 mm | 2.8 | |
| Jan. 27 | Patchy rain possible | 14° /6° | 0 mm | 2.8 | |
| Jan. 28 | Patchy rain possible | 16° /7° | 1.3 mm | 2.9 | |
| Jan. 29 | Mist | 13° /5° | 0 mm | 2.9 | |
| Jan. 30 | Mist | 14° /7° | 0 mm | 2 | |
| Jan. 31 | Moderate rain | 13° /8° | 23.4 mm | 2 | |
| Next | |||||
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.
Change Month
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 14° and lows near 5°, suitable for diverse activities and preferences.
How much rainfall should be expected in Sonoma County during January?
Significant rainfall exceeding 154 mm is expected in Sonoma County during January, occurring over more than 6 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 💧
Typically, Sonoma County has 6 rainy days in January with a total of 154 mm of rainfall.
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