Upper Stillwater Lake Weather Forecast

    • 43
    • 80

    Mostly Sunny

    • 40
    • 81

    Mostly Sunny

    • 43
    • 80

    Mostly Sunny

    • 35
    • 67

    Partly Sunny

    • 37
    • 71

    Mostly Sunny

    • 40
    • 78

    Partly Sunny

Today 18 Sep Kootenai/Cabinet Region

Mostly sunny. Highs in the 80s.

Tonight 18 Sep Kootenai/Cabinet Region

Mostly clear. Lows in the mid 40s to lower 50s.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Upper Stillwater Lake Temperature Statistics

September Temperature

Kalispell, Glacier Park International Airport (25.5 miles)

  • Lowest 9 September, 2025

    44.1 °F

  • Average September

    66.5 °F

  • Highest 2 September, 2025

    93.2 °F

Climate (2020–Present)

Kalispell, Glacier Park International Airport (25.5 miles)

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

  • Average Low 2020–2025

    33.1 °F

  • Average 2020–2025

    45.2 °F

  • Average High 2020–2025

    56.8 °F
Get WillyWeather+ to remove ads