Guerneville Weather Forecast

    • 46
    • 57

    Rain

    • 42
    • 60

    Decreasing Clouds

    • 45
    • 63

    Mostly Cloudy

    • 46
    • 65

    Mostly Cloudy

    • 47
    • 66

    Mostly Cloudy

    • 47
    • 60

    Chance Rain

    • 44
    • 61

    Partly Sunny

Today 27 Jan North Bay Interior Valleys

Rain. Highs in the 50s to lower 60s. South Winds 5 to 15 Mph.

Tonight 27 Jan North Bay Interior Valleys

Mostly cloudy. A chance of rain. Patchy fog after midnight. Lows in the 40s to lower 50s. South Winds 10 to 15 Mph. Becoming northwest 5 to 10 Mph after midnight.

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Guerneville Temperature Statistics

January Temperature

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

  • Lowest 13 January, 2026

    30.7 °F

  • Average January

    50 °F

  • Highest 24 January, 2026

    71.1 °F

Climate (2021–Present)

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

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  • Average Low 2021–2026

    45.6 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    72.5 °F
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