Guerneville Weather Forecast

    • 45
    • 67

    Mostly Cloudy

    • 46
    • 66

    Partly Sunny

    • 45
    • 65

    Mostly Sunny

    • 45
    • 64

    Patchy Fog

    • 45
    • 63

    Areas Fog

    • 44
    • 61

    Areas Fog

    • 45
    • 60

    Patchy Fog

Today 17 Jan North Bay Interior Valleys

Sunny late in the morning then becoming partly cloudy. Highs in the upper 50s to lower 70s. East Winds 5 to 10 Mph.

Tonight 17 Jan North Bay Interior Valleys

Mostly cloudy. Patchy dense fog after midnight. Lows in the upper 30s to lower 50s. Northeast Winds up to 5 Mph.

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Guerneville Temperature Statistics

January Temperature

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

  • Lowest 13 January, 2026

    30.9 °F

  • Average January

    48.6 °F

  • Highest 14 January, 2026

    66 °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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