Loch Lomond Weather Forecast

    • 67
    • 86

    Sunny

    • 68
    • 87

    Mostly Sunny

    • 66
    • 85

    Mostly Sunny

    • 53
    • 74

    Partly Sunny

    • 54
    • 74

    Mostly Sunny

    • 56
    • 73

    Partly Sunny

    • 49
    • 70

    Partly Sunny

Today 18 Mar Southern Lake County

Sunny. Highs 83 to 93.

Tonight 18 Mar Southern Lake County

Clear. Lows 53 to 63.

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Loch Lomond Temperature Statistics

March Temperature

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

  • Lowest 11 March, 2026

    39 °F

  • Average March

    58.9 °F

  • Highest 16 March, 2026

    88 °F

Climate (2021–Present)

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

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  • Average Low 2021–2026

    45.7 °F

  • Average 2021–2026

    58.2 °F

  • Average High 2021–2026

    72.7 °F
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