Big Arm State Park Weather Forecast

    • 38
    • 52

    Increasing Clouds

    • 36
    • 47

    Rain Likely

    • 33
    • 46

    Rain

    • 31
    • 45

    Chance Rain/Snow

    • 29
    • 44

    Slight Chance Rain/Snow

    • 30
    • 47

    Partly Sunny

Today 26 Oct Flathead/Mission Valleys

Mostly cloudy. A 20 percent chance of rain late in the afternoon. Highs in the upper 40s to mid 50s.

Tonight 26 Oct Flathead/Mission Valleys

Rain likely. Chance of rain 70 percent. Lows in the mid 20s to lower 30s.

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Big Arm State Park Temperature Statistics

October Temperature

Kalispell, Glacier Park International Airport (33.6 miles)

  • Lowest 13 October, 2026

    21.7 °F

  • Average October

    46.2 °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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