Triangle Park Weather Forecast

    • 49
    • 79

    Becoming Sunny

    • 50
    • 79

    Rain Likely

    • 45
    • 67

    Rain Likely

    • 46
    • 78

    Mostly Sunny

    • 47
    • 81

    Mostly Sunny

    • 46
    • 78

    Partly Sunny

Today 13 Sep Missoula/Bitterroot Valleys

Mostly sunny. Patchy fog early in the morning. Slight chance of rain early in the afternoon. Slight chance of Showers and Thunderstorms late in the afternoon. Chance of precipitation 20 percent. Highs in the mid to upper 70s.

Tonight 13 Sep Missoula/Bitterroot Valleys

Mostly clear. Lows in the mid to upper 40s.

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Triangle Park Temperature Statistics

September Temperature

Missoula, Missoula International Airport (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 (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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