Grantsdale Weather Forecast

    • 47
    • 75

    Slight Chance Thunderstorms

    • 48
    • 75

    Rain Showers Likely

    • 43
    • 63

    Rain Showers Likely

    • 45
    • 73

    Mostly Sunny

    • 46
    • 80

    Mostly Sunny

    • 45
    • 76

    Partly Sunny

Today 13 Sep Missoula/Bitterroot Valleys

Mostly sunny. Patchy fog early in the morning. A 20 percent chance of Showers and Thunderstorms late in the afternoon. 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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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grantsdale Temperature Statistics

September Temperature

Missoula, Missoula International Airport (49.1 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 (49.1 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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