San Geronimo Weather Forecast

    • 52
    • 74

    Mostly Sunny

    • 56
    • 67

    Increasing Clouds

    • 54
    • 70

    Partly Sunny

    • 54
    • 76

    Mostly Sunny

    • 55
    • 76

    Partly Sunny

    • 54
    • 71

    Partly Sunny

    • 55
    • 72

    Mostly Sunny

Today 15 Sep Marin Coastal Range

Sunny. Highs in the 70s. Southwest Winds 5 to 10 Mph.

Tonight 15 Sep Marin Coastal Range

Mostly clear in the evening then becoming partly cloudy. Lows in the lower 50s. West Winds 5 to 10 Mph.

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San Geronimo Temperature Statistics

September Temperature

Novato / Gnoss Field (10.6 miles)

  • Lowest 6 September, 2026

    48.2 °F

  • Average September

    67.6 °F

  • Highest 9 September, 2026

    100.4 °F

Climate (2021–2026)

Novato / Gnoss Field (10.6 miles)

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  • Average Low 2021–2026

    47 °F

  • Average 2021–2026

    57.8 °F

  • Average High 2021–2026

    72.5 °F
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