San Geronimo Weather Forecast

    • 43
    • 54

    Mostly Sunny

    • 44
    • 55

    Mostly Sunny

    • 43
    • 57

    Mostly Sunny

    • 44
    • 58

    Partly Sunny

    • 50
    • 59

    Chance Rain

    • 51
    • 60

    Chance Rain

Today 11 Dec Marin Coastal Range

Partly cloudy in the morning then becoming sunny. Highs in the mid 60s. East Winds around 5 Mph.

Tonight 11 Dec Marin Coastal Range

Mostly clear. Lows in the mid 40s. Southeast Winds around 5 Mph.

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San Geronimo Temperature Statistics

December Temperature

Novato / Gnoss Field (10.6 miles)

  • Lowest 2 December, 2025

    37.4 °F

  • Average December

    46.3 °F

  • Highest 3 December, 2025

    71.6 °F

Climate (2020–Present)

Novato / Gnoss Field (10.6 miles)

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  • Average Low 2020–2025

    46.2 °F

  • Average 2020–2025

    57.4 °F

  • Average High 2020–2025

    72.3 °F
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