Big Arm Weather Forecast

    • 52
    • 72

    Increasing Clouds

    • 52
    • 74

    Rain Likely

    • 50
    • 65

    Chance Rain

    • 46
    • 61

    Rain Likely

    • 42
    • 54

    Chance Rain

    • 46
    • 60

    Partly Sunny

Today 9 Sep Flathead/Mission Valleys

Mostly sunny. Patchy fog early in the morning. Highs in the 70s. Southwest Winds to 15 Mph.

Tonight 9 Sep Flathead/Mission Valleys

Partly cloudy. Lows in the 40s.

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  • 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

    58.7 °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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