Lake Lagunitas Weather Forecast

    • 56
    • 80

    Becoming Sunny

    • 55
    • 82

    Mostly Sunny

    • 55
    • 74

    Partly Sunny

    • 56
    • 74

    Partly Sunny

    • 57
    • 79

    Mostly Sunny

    • 58
    • 88

    Mostly Sunny

Today 18 Sep North Bay Interior Valleys

Partly cloudy in the morning then becoming sunny. Areas of fog in the morning. Highs in the 70s to 80s. West Winds up to 5 Mph increasing to southwest 10 to 20 Mph in the afternoon.

Tonight 18 Sep North Bay Interior Valleys

Mostly clear except patchy fog after midnight. Lows in the upper 40s to lower 60s. Southwest Winds 5 to 15 Mph.

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Lake Lagunitas Temperature Statistics

September Temperature

Novato / Gnoss Field (13.7 miles)

  • Lowest 6 September, 2026

    48.2 °F

  • Average September

    67.2 °F

  • Highest 9 September, 2026

    100.4 °F

Climate (2021–2026)

Novato / Gnoss Field (13.7 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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