Sonoma County (Santa Rosa)
October
Weather in Sonoma County, California for October 2026
Your guide to Sonoma County weather in October - trends and predictions
In general, the average temperature in Sonoma County at the beginning of October is 30.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20 °C by the end of October.
Sonoma County experiences moderate rainfall in October, with an average of 8 rainy days and a total precipitation of 34.3 mm.
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Temperatures
Rain 🌧️
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23
Dry days
8
Rainy days
0
Snow days
23°/10°
Temperatures
12 km/h
Avg max wind
65 %
Avg humidity
Sonoma County Weather October
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Temperatures trend during October in Sonoma County
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October weather in Sonoma County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Oct. 1 |  Mist | 26° /14° | 4.7 mm | 6 | |
| Oct. 2 |  Cloudy | 28° /12° | 0 mm | 6 | |
| Oct. 3 |  Partly cloudy | 29° /11° | 0 mm | 7 | |
| Oct. 4 |  Sunny | 29° /12° | 0 mm | 7 | |
| Oct. 5 | Sunny | 32° /13° | 0 mm | 7 | |
| Oct. 6 | Partly cloudy | 34° /15° | 0 mm | 8 | |
| Oct. 7 | Sunny | 34° /14° | 0 mm | 8 | |
| Oct. 8 | Sunny | 25° /10° | 0 mm | 6 | |
| Oct. 9 |  Light drizzle | 20° /10° | 1.4 mm | 5 | |
| Oct. 10 | Mist | 19° /9° | 0.1 mm | 5 | |
| Oct. 11 | Mist | 19° /9° | 0 mm | 5 | |
| Oct. 12 | Cloudy | 21° /8° | 0 mm | 5 | |
| Oct. 13 |  Overcast | 19° /10° | 7.5 mm | 4 | |
| Oct. 14 |  Patchy rain possible | 18° /10° | 5.4 mm | 4 | |
| Oct. 15 | Mist | 24° /10° | 0 mm | 5 | |
| Oct. 16 | Mist | 21° /9° | 0 mm | 5 | |
| Oct. 17 | Mist | 25° /8° | 0 mm | 5 | |
| Oct. 18 | Partly cloudy | 28° /9° | 0 mm | 6 | |
| Oct. 19 | Sunny | 29° /11° | 0 mm | 7 | |
| Oct. 20 | Partly cloudy | 28° /11° | 0 mm | 7 | |
| Oct. 21 | Mist | 23° /9° | 0 mm | 5 | |
| Oct. 22 | Mist | 18° /9° | 0.1 mm | 4 | |
| Oct. 23 | Mist | 22° /8° | 0 mm | 5 | |
| Oct. 24 | Mist | 22° /9° | 0 mm | 5 | |
| Oct. 25 | Overcast | 20° /10° | 5.8 mm | 5 | |
| Oct. 26 | Partly cloudy | 20° /8° | 3.1 mm | 5 | |
| Oct. 27 | Overcast | 19° /9° | 0.3 mm | 4 | |
| Oct. 28 | Partly cloudy | 20° /5° | 0 mm | 5 | |
| Oct. 29 | Sunny | 23° /7° | 0 mm | 6 | |
| Oct. 30 | Mist | 18° /7° | 1.1 mm | 4 | |
| Oct. 31 | Partly cloudy | 20° /6° | 4.7 mm | 5 | |
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Important Notice
Our weather forecast for Sonoma County in October 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 October - FAQ
What are the expected maximum and minimum temperatures in Sonoma County during October?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Sonoma County during October?
In October, Sonoma County can expect light to moderate rainfall, totaling 34.3 mm across approximately 8 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Sonoma County during October?
The average wind speed in Sonoma County during October is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
October rainfall patterns in Sonoma County
Explore the daily rainfall trends and prepare for Sonoma Countys October weather 💧
Typically, Sonoma County has 8 rainy days in October with a total of 34.3 mm of rainfall.
UV exposure in Sonoma County during October
Stay informed about UV levels for safe outdoor activities throughout the month of October ☀️
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