Bel Marin Keys Weather Forecast

    • 39
    • 54

    Mostly Sunny

    • 38
    • 53

    Mostly Sunny

    • 40
    • 54

    Mostly Cloudy

    • 40
    • 55

    Partly Sunny

    • 42
    • 56

    Mostly Sunny

    • 44
    • 59

    Partly Sunny

Today 8 Jan North Bay Interior Valleys

Sunny. Highs in the upper 40s to mid 50s. Northwest Winds 10 to 15 Mph.

Tonight 8 Jan North Bay Interior Valleys

Mostly clear in the evening then becoming partly cloudy. Areas of frost after midnight. Lows in the 30s to lower 40s. North Winds 5 to 15 Mph.

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Bel Marin Keys Temperature Statistics

January Temperature

Novato / Gnoss Field (4.3 miles)

  • Lowest 6 January, 2026

    46.4 °F

  • Average January

    54.2 °F

  • Highest 3 January, 2026

    62.6 °F

Climate (2021–Present)

Novato / Gnoss Field (4.3 miles)

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  • Average Low 2021–2026

    46.3 °F

  • Average 2021–2026

    57.4 °F

  • Average High 2021–2026

    72.3 °F
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