Big Arm State Park Weather Forecast

    • 43
    • 72

    Increasing Clouds

    • 43
    • 69

    Mostly Sunny

    • 50
    • 69

    Mostly Sunny

    • 50
    • 68

    Partly Sunny

    • 48
    • 70

    Chance Rain

    • 41
    • 55

    Chance Rain/Snow

Today 5 Oct Flathead/Mission Valleys

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

Tonight 5 Oct Flathead/Mission Valleys

Mostly cloudy in the evening then becoming partly cloudy. Lows in the mid 30s to lower 40s.

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  • Temperature Real-Time

Big Arm State Park Temperature Statistics

October Temperature

Kalispell, Glacier Park International Airport (33.6 miles)

  • Lowest 1 October, 2026

    35.1 °F

  • Average October

    47 °F

  • Highest 2 October, 2026

    66 °F

Climate (2021–2026)

Kalispell, Glacier Park International Airport (33.6 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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