San Rafael Bay - West Marin Island Weather Forecast

    • 47
    • 52

    Mostly Sunny

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    • 54

    Mostly Sunny

    • 47
    • 55

    Mostly Sunny

    • 48
    • 56

    Partly Sunny

    • 49
    • 55

    Mostly Cloudy

    • 54
    • 56

    Chance Rain Showers

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    Chance Rain Showers

Today 10 Dec North Bay Interior Valleys

Sunny. Highs in the upper 40s to mid 60s. South Winds 5 to 10 Mph.

Tonight 10 Dec North Bay Interior Valleys

Mostly clear in the evening then becoming partly cloudy. Widespread dense fog after midnight. Lows in the upper 30s to lower 50s. North Winds 5 to 10 Mph.

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San Rafael Bay - West Marin Island Temperature Statistics

December Temperature

Novato / Gnoss Field (12.4 miles)

  • Lowest 2 December, 2025

    37.4 °F

  • Average December

    46.5 °F

  • Highest 3 December, 2025

    71.6 °F

Climate (2020–Present)

Novato / Gnoss Field (12.4 miles)

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  • Average Low 2020–2025

    46.1 °F

  • Average 2020–2025

    57.4 °F

  • Average High 2020–2025

    72.3 °F
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