Saint Mary Lake Weather Forecast

    • 52
    • 73

    Mostly Sunny

    • 52
    • 73

    Slight Chance Thunderstorms

    • 53
    • 72

    Mostly Sunny

    • 44
    • 60

    Slight Chance Rain

    • 49
    • 60

    Mostly Sunny

    • 51
    • 70

    Mostly Sunny

Today 18 Sep East Glacier Park Region

Sunny. Highs 65 to 75. West Winds 5 to 10 Mph shifting to the north in the afternoon.

Tonight 18 Sep East Glacier Park Region

Mostly clear. Lows 45 to 50. Northeast Winds up to 10 Mph shifting to the southwest after midnight.

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Saint Mary Lake Temperature Statistics

September Temperature

Kalispell, Glacier Park International Airport (45.4 miles)

  • Lowest 9 September, 2025

    44.1 °F

  • Average September

    66.1 °F

  • Highest 2 September, 2025

    93.2 °F

Climate (2020–Present)

Kalispell, Glacier Park International Airport (45.4 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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