Weather in Santa Rosa, California for January 2026
Until now, January 2026 in Santa Rosa has been nearly identical to the historical average, with a temperature of 14.2 °F (showing only a slight deviation of 0.3 °F).
The forecast for the upcoming days in Santa Rosa predicts a temperature of 16.4 °F, which is slightly above the historical average.
In general, the average temperature in Santa Rosa at the beginning of January is 13 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 14.7 °F by the end of January.
Santa Rosa experiences moderate rainfall in January, with an average of 10 rainy days and a total precipitation of 141 mm.
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Santa Rosa Weather January
Temperatures trend during January in Santa Rosa
January weather in Santa Rosa day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jan. 1 |  Sunny | 13° /5° | 15.8 mm | 3 | |
| Jan. 2 |  Overcast | 13° /8° | 9.6 mm | 2 | |
| Jan. 3 |  Moderate or heavy rain with thunder | 12° /8° | 40.1 mm | 2 | |
| Jan. 4 |  Partly cloudy | 12° /6° | 15.6 mm | 3 | |
| Jan. 5 |  Mist | 14° /5° | 0 mm | 2 | |
| Jan. 6 |  Light rain shower | 13° /6° | 2.1 mm | 2 | |
| Jan. 7 | Sunny | 14° /4° | 0 mm | 3 | |
| Jan. 8 | Overcast | 14° /4° | 0 mm | 3 | |
| Jan. 9 |  Light drizzle | 14° /2° | 0.2 mm | 3 | |
| Jan. 10 | Light rain shower | 13° /3° | 0.5 mm | 3 | |
| Jan. 11 | Partly cloudy | 15° /3° | 0 mm | 3 | |
| Jan. 12 | Partly cloudy | 13° /2° | 0 mm | 3 | |
| Jan. 13 |  Moderate rain | 15° /3° | 9.6 mm | 3 | |
| Jan. 14 | Patchy rain possible | 16° /5° | 0.1 mm | 3 | |
| Jan. 15 | Partly cloudy | 17° /4° | 0 mm | 3 | |
| Jan. 16 | Sunny | 16° /5° | 3.2 mm | 3 | |
| Jan. 17 | Sunny | 20° /7° | 0 mm | 0.5 | |
| Jan. 18 | Partly cloudy | 20° /8° | 0 mm | 0.5 | |
| Jan. 19 | Sunny | 19° /8° | 0 mm | 0 | |
| Jan. 20 | Overcast | 18° /8° | 0 mm | 3 | |
| Jan. 21 | Overcast | 16° /10° | 0 mm | 3 | |
| Jan. 22 | Patchy rain possible | 15° /9° | 0.6 mm | 3 | |
| Jan. 23 | Patchy rain possible | 13° /7° | 0.6 mm | 2 | |
| Jan. 24 | Patchy rain possible | 13° /7° | 1.2 mm | 2 | |
| Jan. 25 | Patchy rain possible | 14° /8° | 2.3 mm | 3 | |
| Jan. 26 | Mist | 15° /7° | 0 mm | 3 | |
| Jan. 27 | Sunny | 17° /7° | 0 mm | 4 | |
| Jan. 28 | Partly cloudy | 17° /7° | 0 mm | 4 | |
| Jan. 29 | Patchy rain possible | 16° /8° | 0.2 mm | 3 | |
| Jan. 30 | Partly cloudy | 13° /7° | 0 mm | 4 | |
| Jan. 31 | Moderate rain | 11° /8° | 35 mm | 3 | |
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Santa Rosa in January - FAQ
What are the expected maximum and minimum temperatures in Santa Rosa during January?
How much rainfall should be expected in Santa Rosa during January?
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January rainfall patterns in Santa Rosa
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