Big Arm Weather Forecast

    • 55
    • 72

    Mostly Cloudy

    • 53
    • 71

    Partly Sunny

    • 55
    • 72

    Sunny

    • 55
    • 74

    Mostly Sunny

    • 55
    • 73

    Mostly Sunny

    • 54
    • 71

    Partly Sunny

    • 55
    • 72

    Partly Sunny

Today 18 Sep Flathead/Mission Valleys

Partly cloudy. Highs in the upper 60s to mid 70s.

Tonight 18 Sep Flathead/Mission Valleys

Mostly cloudy. Patchy fog late in the night. 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 1 September, 2026

    41.6 °F

  • Average September

    56.8 °F

  • Highest 1 September, 2026

    84.7 °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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