Big Arm State Park Weather Forecast

    • 51
    • 76

    Increasing Clouds

    • 47
    • 72

    Mostly Sunny

    • 53
    • 77

    Partly Sunny

    • 54
    • 78

    Partly Sunny

    • 51
    • 72

    Slight Chance Rain

    • 47
    • 68

    Slight Chance Rain

Today 10 May Flathead/Mission Valleys

Mostly cloudy. Highs in the mid 70s to lower 80s.

Tonight 10 May Flathead/Mission Valleys

Mostly cloudy in the evening then becoming partly cloudy. Lows in the mid 40s to lower 50s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Arm State Park Temperature Statistics

May Temperature

Kalispell, Glacier Park International Airport (33.6 miles)

  • Lowest 6 May, 2026

    29.6 °F

  • Average May

    52.4 °F

  • Highest 3 May, 2026

    73.7 °F

Climate (2021–Present)

Kalispell, Glacier Park International Airport (33.6 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    45.5 °F

  • Average High 2021–2026

    57.2 °F
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