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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 4 rainy days, Sonoma County experiences minimal rainfall in October, ensuring that most days remain pleasantly dry.

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Average dry days
27
Dry days
Average rainy days
4
Rainy days
Average snowy days
0
Snow days
Average temperatures
25°/9°
Temperatures
Average wind speed
12 km/h
Avg max wind
Average humidity
60 %
Avg humidity

Sonoma County in October average weather

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Temperatures trend during October in Sonoma County

See the weather trend as well as the moving average line

October weather day by day

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Date Weather Temperatures Rain UV More
Oct. 1 Mist
Mist
32° /15° 0 mm 7
Oct. 2 Cloudy
Cloudy
32° /13° 0 mm 8
Oct. 3 Partly cloudy
Partly cloudy
33° /11° 0 mm 9
Oct. 4 Sunny
Sunny
32° /14° 0 mm 7
Oct. 5 Sunny
Sunny
36° /15° 0 mm 9
Oct. 6 Sunny
Sunny
37° /17° 0 mm 9
Oct. 7 Sunny
Sunny
35° /14° 0 mm 9
Oct. 8 Sunny
Sunny
30° /11° 0 mm 8
Oct. 9 Light drizzle
Light drizzle
22° /10° 0.6 mm 5
Oct. 10 Light drizzle
Light drizzle
21° /10° 0.2 mm 5
Oct. 11 Sunny
Sunny
20° /8° 0 mm 5
Oct. 12 Cloudy
Cloudy
21° /8° 0 mm 5
Oct. 13 Overcast
Overcast
22° /10° 0 mm 5
Oct. 14 Patchy rain possible
Patchy rain possible
20° /11° 0.3 mm 5
Oct. 15 Mist
Mist
27° /10° 0 mm 6
Oct. 16 Patchy rain possible
Patchy rain possible
23° /11° 0 mm 5
Oct. 17 Mist
Mist
26° /10° 0 mm 6
Oct. 18 Partly cloudy
Partly cloudy
28° /9° 0 mm 7
Oct. 19 Sunny
Sunny
33° /13° 0 mm 8
Oct. 20 Partly cloudy
Partly cloudy
29° /11° 0 mm 7
Oct. 21 Mist
Mist
20° /8° 0 mm 5
Oct. 22 Patchy rain possible
Patchy rain possible
19° /8° 0.2 mm 5
Oct. 23 Mist
Mist
24° /7° 0 mm 6
Oct. 24 Mist
Mist
24° /9° 0 mm 6
Oct. 25 Overcast
Overcast
22° /9° 0 mm 5
Oct. 26 Partly cloudy
Partly cloudy
22° /6° 0 mm 6
Oct. 27 Overcast
Overcast
18° /8° 0.5 mm 4
Oct. 28 Partly cloudy
Partly cloudy
18° /4° 0 mm 5
Oct. 29 Sunny
Sunny
20° /5° 0 mm 6
Oct. 30 Partly cloudy
Partly cloudy
19° /6° 1.6 mm 5
Oct. 31 Partly cloudy
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.

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 9°. 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 4 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 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 💧

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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Location coordinates 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.

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