Guerneville Weather Forecast

    • 38
    • 57

    Mostly Cloudy

    • 39
    • 60

    Partly Sunny

    • 41
    • 59

    Mostly Sunny

    • 44
    • 63

    Mostly Sunny

    • 46
    • 64

    Mostly Sunny

    • 46
    • 66

    Mostly Sunny

    • 46
    • 66

    Sunny

Today 10 Jan North Bay Interior Valleys

Partly cloudy late in the morning then becoming mostly cloudy. Highs in the 50s. East Winds 5 to 10 Mph.

Tonight 10 Jan North Bay Interior Valleys

Mostly cloudy in the evening then becoming partly cloudy. Lows in the 30s to mid 40s. Northeast Winds 5 to 10 Mph.

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Guerneville Temperature Statistics

January Temperature

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

  • Lowest 8 January, 2026

    39.9 °F

  • Average January

    52.4 °F

  • Highest 3 January, 2026

    61 °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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