Mission Reservoir Weather Forecast

    • 40
    • 55

    Increasing Clouds

    • 46
    • 60

    Mostly Cloudy

    • 46
    • 64

    Mostly Sunny

    • 51
    • 65

    Chance Rain

    • 49
    • 64

    Slight Chance Rain

    • 50
    • 67

    Partly Sunny

    • 48
    • 65

    Slight Chance Rain

Today 26 Sep Flathead/Mission Valleys

Partly cloudy. Highs in the 60s.

Tonight 26 Sep Flathead/Mission Valleys

Mostly clear until early morning then becoming mostly cloudy. Lows in the 30s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mission Reservoir Temperature Statistics

September Temperature

Missoula, Missoula International Airport (27.3 miles)

  • Lowest 9 September, 2026

    38.6 °F

  • Average September

    59 °F

  • Highest 1 September, 2026

    88.6 °F

Climate (2021–2026)

Missoula, Missoula International Airport (27.3 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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