Grantsdale Weather Forecast

    • 49
    • 79

    Rain Showers Likely

    • 51
    • 81

    Chance Thunderstorms

    • 51
    • 82

    Rain Showers Likely

    • 49
    • 79

    Chance Rain Showers

    • 50
    • 80

    Partly Sunny

    • 52
    • 84

    Mostly Sunny

Today 15 Aug Missoula/Bitterroot Valleys

Mostly sunny until late afternoon then becoming mostly cloudy. Patchy fog in the morning. A 40 percent chance of Showers and Thunderstorms in the afternoon. Highs near 80.

Tonight 15 Aug Missoula/Bitterroot Valleys

Mostly cloudy with a 40 percent chance of Showers and Thunderstorms in the Evening, then mostly clear after midnight. Lows in the mid to upper 40s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grantsdale Temperature Statistics

August Temperature

Missoula, Missoula International Airport (49.1 miles)

  • Lowest 4 August, 2026

    43.6 °F

  • Average August

    69.4 °F

  • Highest 1 August, 2026

    96.7 °F

Climate (2021–2026)

Missoula, Missoula International Airport (49.1 miles)

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  • Average Low 2021–2026

    35.9 °F

  • Average 2021–2026

    47.5 °F

  • Average High 2021–2026

    59.7 °F
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