Costich Lake Weather Forecast

    • 47
    • 77

    Increasing Clouds

    • 48
    • 78

    Mostly Sunny

    • 49
    • 79

    Mostly Sunny

    • 49
    • 79

    Mostly Sunny

    • 48
    • 74

    Partly Sunny

    • 47
    • 69

    Partly Sunny

Today 18 Sep Kootenai/Cabinet Region

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

Tonight 18 Sep Kootenai/Cabinet Region

Partly cloudy. Lows in the 40s to lower 50s.

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  • Temperature Real-Time

Costich Lake Temperature Statistics

September Temperature

Kalispell, Glacier Park International Airport (52.8 miles)

  • Lowest 1 September, 2026

    41.6 °F

  • Average September

    56.8 °F

  • Highest 1 September, 2026

    84.7 °F

Climate (2021–2026)

Kalispell, Glacier Park International Airport (52.8 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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