Big Arm State Park Weather Forecast

    • 30
    • 45

    Decreasing Clouds

    • 32
    • 50

    Mostly Sunny

    • 38
    • 54

    Partly Sunny

    • 39
    • 58

    Mostly Sunny

    • 42
    • 60

    Mostly Sunny

    • 43
    • 64

    Partly Sunny

Today 12 Oct Flathead/Mission Valleys

Mostly cloudy in the morning then clearing. Highs in the mid 40s to lower 50s.

Tonight 12 Oct Flathead/Mission Valleys

Mostly clear. Patchy fog. Lows in the 20s.

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Big Arm State Park Temperature Statistics

October Temperature

Kalispell, Glacier Park International Airport (33.6 miles)

  • Lowest 8 October, 2026

    32 °F

  • Average October

    51.5 °F

  • Highest 5 October, 2026

    74.6 °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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