Big Arm State Park Weather Forecast

    • 55
    • 81

    Becoming Sunny

    • 60
    • 80

    Mostly Cloudy

    • 62
    • 83

    Mostly Sunny

    • 60
    • 83

    Mostly Sunny

    • 58
    • 80

    Mostly Sunny

    • 62
    • 84

    Mostly Sunny

Today 5 Jul Flathead/Mission Valleys

Partly cloudy. Highs in the 80s. Southwest Winds to 15 Mph in the afternoon.

Tonight 5 Jul Flathead/Mission Valleys

Mostly clear. Lows in the upper 40s to mid 50s.

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Big Arm State Park Temperature Statistics

July Temperature

Kalispell, Glacier Park International Airport (33.6 miles)

  • Lowest 2 July, 2026

    43.6 °F

  • Average July

    62.5 °F

  • Highest 3 July, 2026

    77 °F

Climate (2021–2026)

Kalispell, Glacier Park International Airport (33.6 miles)

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  • Average Low 2021–2026

    33.4 °F

  • Average 2021–2026

    45.4 °F

  • Average High 2021–2026

    57 °F
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