Brush Bay Weather Forecast

    • 45
    • 80

    Mostly Sunny

    • 43
    • 81

    Mostly Sunny

    • 46
    • 81

    Mostly Sunny

    • 38
    • 68

    Partly Sunny

    • 39
    • 73

    Mostly Sunny

    • 43
    • 79

    Partly Sunny

Today 18 Sep Flathead/Mission Valleys

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

Tonight 18 Sep Flathead/Mission Valleys

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

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Brush Bay Temperature Statistics

September Temperature

Kalispell, Glacier Park International Airport (14.3 miles)

  • Lowest 9 September, 2025

    44.1 °F

  • Average September

    66.5 °F

  • Highest 2 September, 2025

    93.2 °F

Climate (2020–Present)

Kalispell, Glacier Park International Airport (14.3 miles)

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  • Average Low 2020–2025

    33.1 °F

  • Average 2020–2025

    45.2 °F

  • Average High 2020–2025

    56.8 °F
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