Bair Reservoir Weather Forecast

    • 49
    • 79

    Slight Chance Thunderstorms

    • 44
    • 73

    Rain Showers Likely

    • 43
    • 68

    Chance Thunderstorms

    • 44
    • 67

    Chance Rain Showers

    • 44
    • 69

    Slight Chance Thunderstorms

    • 43
    • 71

    Chance Rain Showers

    • 43
    • 67

    Chance Rain Showers

Today 10 Sep Meagher County Valleys

Partly cloudy late in the morning then becoming mostly cloudy. Highs 75 to 80. Southeast Winds up to 10 Mph.

Tonight 10 Sep Meagher County Valleys

Mostly cloudy. Slight chance of Thunderstorms in the Evening, then slight chance of rain Showers after midnight. Lows 45 to 50. East Winds up to 10 Mph. Chance of precipitation 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Bair Reservoir Temperature Statistics

September Temperature

Lewistown, Lewistown Municipal Airport (60.9 miles)

  • Lowest 5 September, 2025

    34 °F

  • Average September

    62 °F

  • Highest 2 September, 2025

    86 °F

Climate (2020–Present)

Lewistown, Lewistown Municipal Airport (60.9 miles)

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  • Average Low 2020–2025

    32.3 °F

  • Average 2020–2025

    44.4 °F

  • Average High 2020–2025

    56.3 °F
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