Flathead Lake State Park - Yellow Bay Unit Weather Forecast

    • 62
    • 83

    Increasing Clouds

    • 60
    • 81

    Chance Rain

    • 59
    • 78

    Chance Rain

    • 58
    • 74

    Chance Rain

    • 57
    • 70

    Rain Likely

    • 56
    • 69

    Rain Likely

Today 6 Sep Flathead/Mission Valleys

Mostly sunny. Patchy smoke. Highs in the 80s.

Tonight 6 Sep Flathead/Mission Valleys

Partly cloudy in the evening then becoming mostly cloudy. Areas of smoke. Lows in the 50s.

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Flathead Lake State Park - Yellow Bay Unit Temperature Statistics

September Temperature

Kalispell, Glacier Park International Airport (31.1 miles)

  • Lowest 3 September, 2025

    53.6 °F

  • Average September

    75.8 °F

  • Highest 2 September, 2025

    93.2 °F

Climate (2020–Present)

Kalispell, Glacier Park International Airport (31.1 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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