Loch Lomond Weather Forecast

    • 51
    • 70

    Mostly Sunny

    • 55
    • 68

    Becoming Sunny

    • 63
    • 78

    Sunny

    • 63
    • 82

    Mostly Sunny

    • 64
    • 79

    Mostly Sunny

    • 68
    • 83

    Sunny

    • 67
    • 86

    Sunny

Today 16 Sep Southwestern Lake

Sunny. Highs 82 to 93.

Tonight 16 Sep Southwestern Lake

Mostly clear. Lows 46 to 56. Southwest wind around 10 Mph.

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Loch Lomond Temperature Statistics

September Temperature

Santa Rosa, Santa Rosa Sonoma County Airport (25.5 miles)

  • Lowest 5 September, 2026

    46.7 °F

  • Average September

    68 °F

  • Highest 10 September, 2026

    101.6 °F

Climate (2021–2026)

Santa Rosa, Santa Rosa Sonoma County Airport (25.5 miles)

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  • Average Low 2021–2026

    45.9 °F

  • Average 2021–2026

    58.7 °F

  • Average High 2021–2026

    72.9 °F
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