Big Arm State Park Weather Forecast

    • 53
    • 74

    Mostly Sunny

    • 54
    • 75

    Sunny

    • 59
    • 80

    Mostly Sunny

    • 58
    • 78

    Chance Rain Showers

    • 56
    • 74

    Chance Rain

    • 55
    • 71

    Chance Rain

Today 4 Sep Flathead/Mission Valleys

Mostly sunny. Areas of smoke through the day. Not as warm. Highs in the mid 70s to lower 80s. Northeast Winds 15 to 20 Mph.

Tonight 4 Sep Flathead/Mission Valleys

Mostly clear. Areas of smoke in the evening. Haze after midnight. Lows in the mid 40s to lower 50s. Northeast Winds 15 to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Arm State Park Temperature Statistics

September Temperature

Kalispell, Glacier Park International Airport (33.6 miles)

  • Lowest 1 September, 2025

    62.6 °F

  • Average September

    76.3 °F

  • Highest 1 September, 2025

    91.4 °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

    45.1 °F

  • Average High 2020–2025

    56.8 °F
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