Guerneville Weather Forecast

    • 53
    • 57

    Rain

    • 45
    • 61

    Dense Fog

    • 51
    • 58

    Cloudy

    • 53
    • 57

    Rain

    • 52
    • 58

    Rain

    • 51
    • 57

    Rain

    • 48
    • 57

    Rain Likely

Today 16 Dec North Bay Interior Valleys

Cloudy. Patchy fog. A chance of rain. Highs in the 50s to lower 60s. South Winds around 5 Mph.

Tonight 16 Dec North Bay Interior Valleys

Patchy fog. Rain likely. Lows in the upper 40s to mid 50s. South Winds 5 to 10 Mph.

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  • Temperature Real-Time

Guerneville Temperature Statistics

December Temperature

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

  • Lowest 4 December, 2025

    34 °F

  • Average December

    43.9 °F

  • Highest 3 December, 2025

    68 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.5 °F

  • Average 2020–2025

    57.9 °F

  • Average High 2020–2025

    72.5 °F
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