Grant Reservoir Weather Forecast

    • 51
    • 82

    Thunderstorms Likely

    • 52
    • 77

    Chance Thunderstorms

    • 49
    • 76

    Slight Chance Thunderstorms

    • 47
    • 74

    Partly Sunny

    • 47
    • 73

    Partly Sunny

    • 49
    • 78

    Mostly Sunny

Today 15 Sep Prairie

Mostly sunny. Highs in the mid 80s. West wind 5 to 10 Mph.

Tonight 15 Sep Prairie

Mostly cloudy with a 40 percent chance of Thunderstorms. Some Thunderstorms may produce gusty Winds. Lows in the lower 50s. Southwest wind 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grant Reservoir Temperature Statistics

September Temperature

Miles City, Frank Wiley Field Airport (32.3 miles)

  • Lowest 5 September, 2025

    39 °F

  • Average September

    67.2 °F

  • Highest 1 September, 2025

    93.9 °F

Climate (2020–Present)

Miles City, Frank Wiley Field Airport (32.3 miles)

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  • Average Low 2020–2025

    35.4 °F

  • Average 2020–2025

    47.5 °F

  • Average High 2020–2025

    59.7 °F
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