Big Arm Weather Forecast

    • 50
    • 60

    Gradual Clearing

    • 50
    • 67

    Mostly Sunny

    • 53
    • 71

    Chance Rain Showers

    • 53
    • 69

    Mostly Sunny

    • 53
    • 68

    Mostly Sunny

    • 53
    • 70

    Mostly Sunny

Today 15 Sep Flathead/Mission Valleys

Cloudy. Patchy fog early in the morning. Highs in the upper 50s to mid 60s.

Tonight 15 Sep Flathead/Mission Valleys

Mostly cloudy until early morning then becoming partly cloudy. A 20 percent chance of rain in the evening. Lows in the 40s.

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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

    57.9 °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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