Nicasio Weather Forecast

    • 56
    • 76

    Mostly Cloudy

    • 57
    • 74

    Mostly Cloudy

    • 54
    • 74

    Partly Sunny

    • 54
    • 76

    Partly Sunny

    • 53
    • 75

    Mostly Sunny

Today 7 Sep Marin Coastal Range

Partly cloudy. Highs in the mid 70s. West Winds 5 to 10 Mph.

Tonight 7 Sep Marin Coastal Range

Mostly clear in the evening then becoming partly cloudy. A slight chance of rain after midnight. Lows in the upper 50s. West Winds 5 to 10 Mph.

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Nicasio Temperature Statistics

September Temperature

Novato / Gnoss Field (9.3 miles)

  • Lowest 1 September, 2025

    51.8 °F

  • Average September

    64.8 °F

  • Highest 1 September, 2025

    89.6 °F

Climate (2020–Present)

Novato / Gnoss Field (9.3 miles)

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  • Average Low 2020–2025

    46 °F

  • Average 2020–2025

    57.4 °F

  • Average High 2020–2025

    72.6 °F
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