Guerneville Weather Forecast

    • 53
    • 76

    Increasing Clouds

    • 52
    • 76

    Partly Sunny

    • 51
    • 78

    Mostly Sunny

    • 54
    • 82

    Mostly Sunny

    • 56
    • 88

    Mostly Sunny

    • 54
    • 86

    Mostly Sunny

Today 26 Aug North Bay Interior Valleys

Mostly cloudy in the morning then becoming sunny. Patchy dense fog in the morning. Highs in the upper 60s to mid 80s. Southwest Winds 10 to 20 Mph.

Tonight 26 Aug North Bay Interior Valleys

Mostly clear in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows in the 50s. Southwest Winds 10 to 20 Mph.

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Guerneville Temperature Statistics

August Temperature

Santa Rosa, Santa Rosa Sonoma County Airport (9.3 miles)

  • Lowest 19 August, 2025

    46.7 °F

  • Average August

    70.2 °F

  • Highest 21 August, 2025

    100.7 °F

Climate (2020–Present)

Santa Rosa, Santa Rosa Sonoma County Airport (9.3 miles)

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  • Average Low 2020–2025

    45.3 °F

  • Average 2020–2025

    57.8 °F

  • Average High 2020–2025

    72.8 °F
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