Big Arm Weather Forecast

    • 40
    • 58

    Mostly Sunny

    • 42
    • 64

    Mostly Sunny

    • 47
    • 69

    Mostly Sunny

    • 48
    • 71

    Mostly Cloudy

    • 48
    • 71

    Mostly Sunny

    • 49
    • 73

    Mostly Sunny

    • 50
    • 74

    Mostly Sunny

Today 29 Apr Flathead/Mission Valleys

Mostly cloudy with a 40 percent chance of Areas of rain. Patchy fog early in the morning. Highs in the mid 50s to lower 60s.

Tonight 29 Apr Flathead/Mission Valleys

Mostly clear. Lows in the 30s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Arm Temperature Statistics

April Temperature

Kalispell, Glacier Park International Airport (34.8 miles)

  • Lowest 8 April, 2026

    20.6 °F

  • Average April

    43.3 °F

  • Highest 6 April, 2026

    67.6 °F

Climate (2021–Present)

Kalispell, Glacier Park International Airport (34.8 miles)

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  • Average Low 2021–2026

    33.5 °F

  • Average 2021–2026

    45.6 °F

  • Average High 2021–2026

    57.2 °F
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