Upper Lake Weather Forecast

    • 50
    • 85

    Mostly Sunny

    • 53
    • 85

    Sunny

    • 56
    • 94

    Sunny

    • 56
    • 96

    Sunny

    • 56
    • 93

    Mostly Sunny

    • 55
    • 91

    Mostly Sunny

Today 13 Sep Southern Lake County

Sunny. Highs 78 to 91.

Tonight 13 Sep Southern Lake County

Mostly clear. Lows 51 to 61.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Upper Lake Temperature Statistics

September Temperature

Ukiah Municipal Airport (15.5 miles)

  • Lowest 7 September, 2025

    50 °F

  • Average September

    69.5 °F

  • Highest 2 September, 2025

    102.9 °F

Climate (2020–Present)

Ukiah Municipal Airport (15.5 miles)

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

  • Average Low 2020–2025

    46.8 °F

  • Average 2020–2025

    60.7 °F

  • Average High 2020–2025

    76.3 °F
Get WillyWeather+ to remove ads