Loch Lomond Weather Forecast

    • 51
    • 60

    Partly Sunny

    • 55
    • 61

    Chance Rain

    • 53
    • 59

    Rain

    • 48
    • 56

    Chance Rain

    • 51
    • 55

    Rain

    • 49
    • 55

    Rain

    • 48
    • 51

    Rain Likely

Today 14 Dec Southern Lake County

Sunny in the morning then becoming partly cloudy. Patchy valley fog in the morning. Highs 59 to 69.

Tonight 14 Dec Southern Lake County

Partly cloudy. Lows 40 to 50.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Loch Lomond Temperature Statistics

December Temperature

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

  • Lowest 4 December, 2025

    34 °F

  • Average December

    44.5 °F

  • Highest 3 December, 2025

    68 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.5 °F

  • Average 2020–2025

    57.9 °F

  • Average High 2020–2025

    72.5 °F
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