Sonoma County (Santa Rosa)
October
Weather in Sonoma County for October 2025
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 33.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.9 °F by the end of October.
With an average of 2 rainy days, Sonoma County experiences minimal rainfall in October.
Halloween weather in Sonoma County 🎃 - See the complete forecast for Thursday, October 31.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
29
Dry days
2
Rainy days
0
Snow days
25°/10°
Temperatures
13 km/h
Avg max wind
60 %
Avg humidity
Sonoma County in October average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  32° | 2  32° | 3  33° | 4  32° | 5 36° | ||
| 6 37° | 7 35° | 8 30° | 9  22° | 10 21° | 11 20° | 12 21° |
| 13  22° | 14  20° | 15 27° | 16 23° | 17 26° | 18 28° | 19 33° |
| 20 29° | 21 20° | 22 19° | 23 24° | 24 24° | 25 22° | 26 22° |
| 27 18° | 28 18° | 29 20° | 30 19° | 31 20° |
You can click on date
Access Sonoma County weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during October in Sonoma County
See the weather trend as well as the moving average line
October weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Oct. 1 | Mist | 32° /15° | 0 mm | 7 | |
| Oct. 2 | Cloudy | 32° /13° | 0 mm | 8 | |
| Oct. 3 | Partly cloudy | 33° /11° | 0 mm | 9 | |
| Oct. 4 | Sunny | 32° /14° | 0 mm | 7 | |
| Oct. 5 | Sunny | 36° /15° | 0 mm | 9 | |
| Oct. 6 | Sunny | 37° /17° | 0 mm | 9 | |
| Oct. 7 | Sunny | 35° /14° | 0 mm | 9 | |
| Oct. 8 | Sunny | 30° /11° | 0 mm | 8 | |
| Oct. 9 | Light drizzle | 22° /10° | 0.6 mm | 5 | |
| Oct. 10 | Light drizzle | 21° /10° | 0.2 mm | 5 | |
| Oct. 11 | Sunny | 20° /8° | 0 mm | 5 | |
| Oct. 12 | Cloudy | 21° /8° | 0 mm | 5 | |
| Oct. 13 | Overcast | 22° /10° | 0 mm | 5 | |
| Oct. 14 | Patchy rain possible | 20° /11° | 0.3 mm | 5 | |
| Oct. 15 | Mist | 27° /10° | 0 mm | 6 | |
| Oct. 16 | Patchy rain possible | 23° /11° | 0 mm | 5 | |
| Oct. 17 | Mist | 26° /10° | 0 mm | 6 | |
| Oct. 18 | Partly cloudy | 28° /9° | 0 mm | 7 | |
| Oct. 19 | Sunny | 33° /13° | 0 mm | 8 | |
| Oct. 20 | Partly cloudy | 29° /11° | 0 mm | 7 | |
| Oct. 21 | Mist | 20° /8° | 0 mm | 5 | |
| Oct. 22 | Patchy rain possible | 19° /8° | 0.2 mm | 5 | |
| Oct. 23 | Mist | 24° /7° | 0 mm | 6 | |
| Oct. 24 | Mist | 24° /9° | 0 mm | 6 | |
| Oct. 25 | Overcast | 22° /9° | 0 mm | 5 | |
| Oct. 26 | Partly cloudy | 22° /6° | 0 mm | 6 | |
| Oct. 27 | Overcast | 18° /8° | 0.5 mm | 4 | |
| Oct. 28 | Partly cloudy | 18° /4° | 0 mm | 5 | |
| Oct. 29 | Sunny | 20° /5° | 0 mm | 6 | |
| Oct. 30 | Partly cloudy | 19° /6° | 1.6 mm | 5 | |
| Oct. 31 | Partly cloudy | 20° /6° | 4.7 mm | 5 | |
| Next | |||||
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.
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 25° 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?
Rainfall in Sonoma County during October is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 2 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in Sonoma County during October?
The average wind speed in Sonoma County during October is 13 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 💧
UV exposure in Sonoma County during October
Stay informed about UV levels for safe outdoor activities throughout the month of October ☀️
Top locations in Sonoma County
Select a location for an accurate weather forecast
More Locations Quick links
You are here
Where is Sonoma County?Get accurate weather forecasts for Sonoma County, located at latitude 38.44 and longitude -122.714. Stay updated with localized weather information tailored for Sonoma County.
Found a mistake?
We appreciate your attention to details. Tell us here.