Loch Lomond Marina Weather Forecast

    • 57
    • 64

    Increasing Clouds

    • 57
    • 69

    Mostly Sunny

    • 58
    • 78

    Mostly Sunny

    • 59
    • 75

    Mostly Sunny

    • 54
    • 81

    Mostly Sunny

    • 54
    • 77

    Mostly Sunny

    • 54
    • 76

    Mostly Sunny

Today 21 Sep North Bay Interior Valleys

Partly cloudy late in the morning then becoming sunny. Highs in the mid 60s to lower 80s. Southwest Winds 5 to 10 Mph increasing to 10 to 20 Mph in the afternoon.

Tonight 21 Sep North Bay Interior Valleys

Partly cloudy in the evening then becoming mostly cloudy. Patchy fog in the evening. Areas of fog after midnight. Lows in the 40s to upper 50s. Southwest Winds 5 to 15 Mph.

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Loch Lomond Marina Temperature Statistics

September Temperature

Novato / Gnoss Field (12.4 miles)

  • Lowest 6 September, 2026

    48.2 °F

  • Average September

    66.2 °F

  • Highest 9 September, 2026

    100.4 °F

Climate (2021–2026)

Novato / Gnoss Field (12.4 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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