Flathead Lake Weather Forecast

    • 49
    • 74

    Rain Likely

    • 45
    • 54

    Rain Likely

    • 39
    • 59

    Chance Rain

    • 45
    • 64

    Mostly Sunny

    • 52
    • 72

    Mostly Sunny

    • 48
    • 71

    Mostly Sunny

Today 3 May Flathead/Mission Valleys

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

Tonight 3 May Flathead/Mission Valleys

Mostly cloudy with a 50 percent chance of rain. Lows in the 40s to lower 50s. Southwest Winds to 15 Mph.

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Flathead Lake Temperature Statistics

May Temperature

Kalispell, Glacier Park International Airport (30.4 miles)

  • Lowest 1 May, 2025

    32 °F

  • Average May

    51.2 °F

  • Highest 1 May, 2025

    68 °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

    44.9 °F

  • Average High 2020–2025

    56.5 °F
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