Guerneville Weather Forecast

    • 44
    • 60

    Dense Fog

    • 46
    • 64

    Becoming Sunny

    • 48
    • 67

    Mostly Sunny

    • 48
    • 67

    Mostly Sunny

    • 46
    • 67

    Mostly Sunny

    • 46
    • 64

    Areas Fog

    • 47
    • 62

    Mostly Cloudy

Today 8 Dec North Bay Interior Valleys

Sunny. Highs in the upper 40s to lower 60s. South Winds up to 5 Mph.

Tonight 8 Dec North Bay Interior Valleys

Partly cloudy in the evening then becoming mostly cloudy. Areas of fog. Lows in the 30s to upper 40s. Northeast Winds up to 5 Mph.

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Guerneville Temperature Statistics

December Temperature

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

  • Lowest 4 December, 2025

    34 °F

  • Average December

    45.5 °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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