Big Arm State Park Weather Forecast

    • 43
    • 55

    Chance Rain

    • 39
    • 60

    Slight Chance Rain

    • 43
    • 66

    Sunny

    • 51
    • 75

    Mostly Sunny

    • 44
    • 69

    Mostly Sunny

    • 50
    • 75

    Partly Sunny

    • 54
    • 79

    Partly Sunny

Today 4 May Flathead/Mission Valleys

Rain likely. Chance of rain 80 percent. Cooler. Highs in the 50s.

Tonight 4 May Flathead/Mission Valleys

Mostly cloudy with a 30 percent chance of Areas of rain. Lows in the mid 30s to lower 40s.

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Big Arm State Park Temperature Statistics

May Temperature

Kalispell, Glacier Park International Airport (33.6 miles)

  • Lowest 1 May, 2025

    32 °F

  • Average May

    52.7 °F

  • Highest 2 May, 2025

    75 °F

Climate (2020–Present)

Kalispell, Glacier Park International Airport (33.6 miles)

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  • Average Low 2020–2025

    33 °F

  • Average 2020–2025

    44.9 °F

  • Average High 2020–2025

    56.5 °F
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