Nicasio Weather Forecast

    • 49
    • 74

    Increasing Clouds

    • 50
    • 70

    Mostly Cloudy

    • 48
    • 66

    Partly Sunny

    • 51
    • 75

    Mostly Sunny

    • 54
    • 82

    Mostly Sunny

    • 53
    • 81

    Mostly Sunny

Today 25 Sep Marin Coastal Range

Sunny. Highs in the lower 70s. West Winds 10 to 15 Mph.

Tonight 25 Sep Marin Coastal Range

Mostly clear in the evening then becoming partly cloudy. Lows in the upper 40s. West Winds 5 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Nicasio Temperature Statistics

September Temperature

Novato / Gnoss Field (9.3 miles)

  • Lowest 6 September, 2026

    48.2 °F

  • Average September

    65.7 °F

  • Highest 9 September, 2026

    100.4 °F

Climate (2021–2026)

Novato / Gnoss Field (9.3 miles)

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  • Average Low 2021–2026

    47 °F

  • Average 2021–2026

    57.8 °F

  • Average High 2021–2026

    72.4 °F
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