Grantsdale Weather Forecast

    • 38
    • 59

    Chance Rain

    • 43
    • 68

    Mostly Cloudy

    • 44
    • 71

    Mostly Sunny

    • 47
    • 74

    Rain Showers Likely

    • 45
    • 70

    Chance Rain

    • 44
    • 70

    Partly Sunny

Today 14 Sep Missoula/Bitterroot Valleys

Mostly cloudy. A 50 percent chance of Areas of rain until late afternoon. Highs near 60. West Winds to 15 Mph in the afternoon.

Tonight 14 Sep Missoula/Bitterroot Valleys

Partly cloudy. Lows in the mid to upper 30s.

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  • Temperature Real-Time

Grantsdale Temperature Statistics

September Temperature

Missoula, Missoula International Airport (49.1 miles)

  • Lowest 9 September, 2026

    38.6 °F

  • Average September

    59.6 °F

  • Highest 1 September, 2026

    88.6 °F

Climate (2021–2026)

Missoula, Missoula International Airport (49.1 miles)

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  • Average Low 2021–2026

    36 °F

  • Average 2021–2026

    47.6 °F

  • Average High 2021–2026

    59.7 °F
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