Saint Marys Lake Weather Forecast

    • 60
    • 82

    Increasing Clouds

    • 57
    • 79

    Chance Rain Showers

    • 57
    • 75

    Partly Sunny

    • 53
    • 70

    Rain Showers Likely

    • 52
    • 66

    Rain Likely

    • 51
    • 64

    Rain Showers Likely

Today 6 Sep Potomac/Seeley Lake Region

Mostly sunny. Patchy smoke in the Morning, then Areas of smoke in the afternoon. Highs in the 80s.

Tonight 6 Sep Potomac/Seeley Lake Region

Mostly cloudy. Areas of smoke. Lows in the upper 40s to mid 50s.

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Saint Marys Lake Temperature Statistics

September Temperature

Missoula, Missoula International Airport (24.9 miles)

  • Lowest 1 September, 2025

    52 °F

  • Average September

    71.7 °F

  • Highest 2 September, 2025

    96.1 °F

Climate (2020–Present)

Missoula, Missoula International Airport (24.9 miles)

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  • Average Low 2020–2025

    35.5 °F

  • Average 2020–2025

    47 °F

  • Average High 2020–2025

    59.2 °F
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