Loch Lomond Weather Forecast

    • 57
    • 68

    Chance Rain

    • 57
    • 62

    Rain Likely

    • 59
    • 66

    Chance Rain

    • 63
    • 71

    Mostly Sunny

    • 63
    • 76

    Mostly Sunny

    • 62
    • 74

    Partly Sunny

    • 61
    • 72

    Mostly Sunny

Today 8 Sep Southern Lake County

Mostly sunny until early afternoon then becoming mostly cloudy. Slight chance of rain in the Morning, then chance of rain in the afternoon. Highs 69 to 82.

Tonight 8 Sep Southern Lake County

Partly cloudy early in the evening then becoming mostly cloudy. Chance of rain. Lows 51 to 61.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Loch Lomond Temperature Statistics

September Temperature

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

  • Lowest 1 September, 2025

    51.1 °F

  • Average September

    65.9 °F

  • Highest 1 September, 2025

    99 °F

Climate (2020–Present)

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

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    45.3 °F

  • Average 2020–2025

    57.9 °F

  • Average High 2020–2025

    72.8 °F
Get WillyWeather+ to remove ads