Big Arm Weather Forecast

    • 55
    • 75

    Mostly Sunny

    • 54
    • 76

    Mostly Sunny

    • 54
    • 77

    Mostly Sunny

    • 47
    • 65

    Chance Rain

    • 48
    • 65

    Mostly Sunny

    • 51
    • 71

    Mostly Sunny

Today 18 Sep Flathead/Mission Valleys

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

Tonight 18 Sep Flathead/Mission Valleys

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

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Big Arm Temperature Statistics

September Temperature

Kalispell, Glacier Park International Airport (34.8 miles)

  • Lowest 9 September, 2025

    44.1 °F

  • Average September

    66.1 °F

  • Highest 2 September, 2025

    93.2 °F

Climate (2020–Present)

Kalispell, Glacier Park International Airport (34.8 miles)

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  • Average Low 2020–2025

    33.1 °F

  • Average 2020–2025

    45.2 °F

  • Average High 2020–2025

    56.8 °F
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