San Rafael Bay - West Marin Island Weather Forecast

    • 60
    • 69

    Mostly Sunny

    • 58
    • 66

    Breezy

    • 58
    • 68

    Sunny

    • 56
    • 73

    Mostly Sunny

    • 56
    • 69

    Partly Sunny

    • 56
    • 67

    Mostly Sunny

Today 11 Sep North Bay Interior Valleys

Partly cloudy in the morning then becoming sunny. Highs in the mid 70s to upper 80s. Southwest Winds 10 to 20 Mph.

Tonight 11 Sep North Bay Interior Valleys

Mostly clear. Lows in the mid 50s to lower 60s. Southwest Winds 10 to 15 Mph.

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San Rafael Bay - West Marin Island Temperature Statistics

September Temperature

Novato / Gnoss Field (12.4 miles)

  • Lowest 6 September, 2026

    48.2 °F

  • Average September

    65.7 °F

  • Highest 8 September, 2026

    96.8 °F

Climate (2021–2026)

Novato / Gnoss Field (12.4 miles)

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  • Average Low 2021–2026

    46.9 °F

  • Average 2021–2026

    57.8 °F

  • Average High 2021–2026

    72.4 °F
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