Best year time to visit Sonoma County

General weather information about Sonoma County

Average annual temperature is 14.8 °C

Absolute maximum temperature: 41.3 °C

Absolute minimum temperature: -0.2 °C

Number of sunny days: 256 days

Number of rainy days: 109 days

Look at detailed online map of Sonoma County

* Weather data for Sonoma County United States is based on climate observations for 2026 year

Sonoma County air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)22.022.019.130.830.733.441.339.733.435.525.921.0
Average daytime temperature (°C)15.014.913.620.222.424.433.431.626.325.619.316.5
Average temperature (°C)9.58.48.412.915.317.122.922.118.417.412.911.3
Average night temperature (°C)6.04.14.87.310.111.514.415.313.312.38.68.2
Absolute minimum temperature (°C)0.4-0.20.62.76.39.411.111.89.84.22.64.5

Sonoma County monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.014.013.011.010.09.0
Daylight mean duration (h)9.810.812.013.214.314.814.513.612.411.210.19.5
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)5.68.07.911.211.312.013.211.910.58.47.65.4
Precipitation (mm)4801023992552000926102273
Sunny days13159242229313025221917
Rainy days18132269101591114
Snow days000000000000

Sonoma County - weather forecast by months

Sonoma County weather in januarySonoma County weather in februarySonoma County weather in marchSonoma County weather in aprilSonoma County weather in maySonoma County weather in juneSonoma County weather in julySonoma County weather in augustSonoma County weather in septemberSonoma County weather in octoberSonoma County weather in novemberSonoma County weather in december

Best time to visit Sonoma County:

The best time to visit Sonoma County during the most sunny months:

  • June — 12.0(h)
  • July — 13.2(h)
  • August — 11.9(h)

The largest precipitation sum in Sonoma County is at

  • January — 480(mm)
  • March — 399(mm)
  • December — 273(mm)

    • Weather forecast in the closest to Sonoma County admin centers

    Weather forecast in the closest towns to Sonoma County

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    MapTrains schedule
    Plan your trip
    AccommodationExperiencesBlog

    Frequently asked questions

    When is the best time to visit Sonoma County?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Sonoma County.
    What is the weather like in Sonoma County?
    See average temperature, rainfall and daylight hours for Sonoma County by month in the table above.
    How many sunny days does Sonoma County have?
    The monthly weather statistics above show sunshine and rainfall patterns for Sonoma County throughout the year.