Petty Mountain Weather Forecast

    • 46
    • 62

    Rain Showers

    • 40
    • 52

    Increasing Clouds

    • 37
    • 52

    Rain Likely

    • 36
    • 39

    Rain Likely

    • 35
    • 43

    Partly Sunny

    • 37
    • 48

    Partly Sunny

    • 37
    • 51

    Mostly Sunny

Today 10 Sep Lower Clark Fork Region

Partly cloudy. Highs in the mid 70s to lower 80s. West Winds to 15 Mph with Gusts to around 30 Mph in the afternoon.

Tonight 10 Sep Lower Clark Fork Region

Rain Showers likely and a slight chance of Thunderstorms early in the Evening, then Areas of rain late in the evening. Rain Showers likely and a slight chance of Thunderstorms after midnight. Chance of precipitation 70 percent. Lows in the mid 40s to lower 50s. West Winds to 15 Mph in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Petty Mountain Temperature Statistics

September Temperature

Missoula, Missoula International Airport (14.3 miles)

  • Lowest 8 September, 2026

    42.1 °F

  • Average September

    58.9 °F

  • Highest 1 September, 2026

    88.6 °F

Climate (2021–2026)

Missoula, Missoula International Airport (14.3 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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