Big Arm Weather Forecast

    • 53
    • 75

    Increasing Clouds

    • 57
    • 82

    Mostly Cloudy

    • 50
    • 69

    Rain Showers Likely

    • 47
    • 66

    Slight Chance Rain

    • 50
    • 70

    Partly Sunny

    • 53
    • 74

    Slight Chance Rain

Today 31 Aug Flathead/Mission Valleys

Mostly sunny. Patchy fog early in the morning. Highs in the 70s.

Tonight 31 Aug Flathead/Mission Valleys

Mostly clear. Lows in the 40s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Arm Temperature Statistics

August Temperature

Kalispell, Glacier Park International Airport (34.8 miles)

  • Lowest 5 August, 2026

    38.6 °F

  • Average August

    65.1 °F

  • Highest 1 August, 2026

    93.7 °F

Climate (2021–2026)

Kalispell, Glacier Park International Airport (34.8 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    45.4 °F

  • Average High 2021–2026

    57 °F
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