Boulder Lake Weather Forecast

    • 40
    • 58

    Rain Showers Likely

    • 41
    • 43

    Rain Showers Likely

    • 45
    • 54

    Mostly Sunny

    • 45
    • 59

    Mostly Sunny

    • 43
    • 56

    Partly Sunny

    • 42
    • 52

    Partly Sunny

Today 14 Sep Potomac/Seeley Lake Region

Mostly sunny in the Morning, then mostly cloudy with a 20 percent chance of rain in the afternoon. Patchy fog in the morning. Highs in the 70s.

Tonight 14 Sep Potomac/Seeley Lake Region

Rain Showers likely and a slight chance of Thunderstorms in the Evening, then rain likely after midnight. Chance of precipitation 70 percent. Lows in the 40s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Boulder Lake Temperature Statistics

September Temperature

Missoula, Missoula International Airport (15.5 miles)

  • Lowest 9 September, 2025

    48 °F

  • Average September

    68.4 °F

  • Highest 2 September, 2025

    96.1 °F

Climate (2020–Present)

Missoula, Missoula International Airport (15.5 miles)

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  • Average Low 2020–2025

    35.6 °F

  • Average 2020–2025

    47.1 °F

  • Average High 2020–2025

    59.2 °F
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