Sonoma Weather in October

The climate in Sonoma during October can be summarized as mild and reasonably dry.

October is in the fall / autumn in Sonoma and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a comfortable 24°C (75°F), whilst at night 9°C (48°F) is normal.

On average October is the 6th driest month of the year in Sonoma with around 44mm 1.7 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 4 days, although this may vary considerably.

On the flip side this corresponds to an average of 9 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Sonoma in October 2025.