Lakeside (Flathead Lake) Weather Forecast

    • 55
    • 81

    Mostly Sunny

    • 58
    • 88

    Mostly Sunny

    • 58
    • 87

    Partly Sunny

    • 56
    • 82

    Chance Rain

    • 56
    • 76

    Chance Rain

    • 55
    • 76

    Chance Rain

Today 5 Sep Flathead/Mission Valleys

Mostly sunny. Highs in the mid 70s to lower 80s.

Tonight 5 Sep Flathead/Mission Valleys

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

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Lakeside (Flathead Lake) Temperature Statistics

September Temperature

Kalispell, Glacier Park International Airport (19.3 miles)

  • Lowest 2 September, 2025

    55.4 °F

  • Average September

    76.1 °F

  • Highest 2 September, 2025

    93.2 °F

Climate (2020–Present)

Kalispell, Glacier Park International Airport (19.3 miles)

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  • Average Low 2020–2025

    33 °F

  • Average 2020–2025

    45.1 °F

  • Average High 2020–2025

    56.8 °F
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