Big Arm Weather Forecast

    • 46
    • 70

    Mostly Sunny

    • 50
    • 73

    Partly Sunny

    • 50
    • 70

    Mostly Sunny

    • 49
    • 69

    Mostly Sunny

    • 50
    • 69

    Partly Sunny

    • 47
    • 69

    Chance Rain

Today 4 Oct Flathead/Mission Valleys

Mostly sunny. Highs in the upper 60s to mid 70s.

Tonight 4 Oct Flathead/Mission Valleys

Mostly clear. Lows in the mid 30s to lower 40s.

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  • Temperature Real-Time

Big Arm Temperature Statistics

October Temperature

Kalispell, Glacier Park International Airport (34.8 miles)

  • Lowest 1 October, 2026

    35.1 °F

  • Average October

    45.9 °F

  • Highest 1 October, 2026

    60.1 °F

Climate (2021–2026)

Kalispell, Glacier Park International Airport (34.8 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    45.4 °F

  • Average High 2021–2026

    57 °F
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