Guerneville Weather Forecast

    • 47
    • 62

    Mostly Cloudy

    • 47
    • 60

    Mostly Cloudy

    • 46
    • 61

    Areas Fog

    • 43
    • 60

    Mostly Sunny

    • 41
    • 61

    Partly Sunny

    • 43
    • 59

    Areas Fog

    • 43
    • 60

    Areas Fog

Today 20 Jan North Bay Interior Valleys

Mostly cloudy. Patchy fog late in the morning. Highs in the lower 50s to mid 60s. Southeast Winds 5 to 10 Mph.

Tonight 20 Jan North Bay Interior Valleys

Cloudy. Patchy fog in the evening. Areas of fog after midnight. Lows in the 40s to lower 50s. East Winds up to 5 Mph becoming north 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

    30.9 °F

  • Average January

    48.3 °F

  • Highest 16 January, 2026

    68 °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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