Big Arm State Park Weather Forecast

    • 50
    • 74

    Decreasing Clouds

    • 53
    • 78

    Partly Sunny

    • 48
    • 65

    Rain Likely

    • 50
    • 65

    Chance Rain

    • 53
    • 73

    Chance Rain Showers

    • 52
    • 71

    Rain Showers Likely

Today 24 May Flathead/Mission Valleys

Mostly sunny. Highs in the 70s to lower 80s. Southwest Winds 15 to 20 Mph.

Tonight 24 May Flathead/Mission Valleys

Mostly clear. Lows in the 40s to lower 50s. Southwest Winds to 15 Mph.

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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

    51.3 °F

  • Highest 12 May, 2026

    76.6 °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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