Big Arm Weather Forecast

    • 51
    • 62

    Gradual Clearing

    • 48
    • 56

    Rain

    • 48
    • 56

    Chance Rain

    • 48
    • 59

    Partly Sunny

    • 48
    • 61

    Mostly Sunny

    • 51
    • 65

    Mostly Sunny

Today 12 Sep Flathead/Mission Valleys

Mostly cloudy. Highs in the 60s.

Tonight 12 Sep Flathead/Mission Valleys

Mostly clear. Lows in the 40s. North Winds to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Arm Temperature Statistics

September Temperature

Kalispell, Glacier Park International Airport (34.8 miles)

  • Lowest 1 September, 2026

    41.6 °F

  • Average September

    57.7 °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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