Flathead Lake Weather Forecast

    • 62
    • 82

    Partly Sunny

    • 63
    • 85

    Mostly Sunny

    • 62
    • 85

    Mostly Sunny

    • 63
    • 84

    Mostly Sunny

    • 61
    • 83

    Partly Sunny

    • 62
    • 80

    Partly Sunny

Today 31 Aug Flathead/Mission Valleys

Mostly sunny. Haze. Highs in the mid 80s to lower 90s.

Tonight 31 Aug Flathead/Mission Valleys

Partly cloudy. A 20 percent chance of rain in the evening. Haze in the evening. Lows in the 50s.

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Flathead Lake Temperature Statistics

August Temperature

Kalispell, Glacier Park International Airport (30.4 miles)

  • Lowest 15 August, 2025

    43.6 °F

  • Average August

    66.8 °F

  • Highest 12 August, 2025

    91.7 °F

Climate (2020–Present)

Kalispell, Glacier Park International Airport (30.4 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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