Grant Reservoir Weather Forecast

    • 20
    • 36

    Decreasing Clouds

    • 19
    • 32

    Partly Sunny

    • 24
    • 36

    Mostly Cloudy

    • 30
    • 49

    Partly Sunny

    • 35
    • 50

    Mostly Cloudy

    • 28
    • 48

    Mostly Cloudy

Today 8 Jan Prairie

Mostly sunny this Morning, then becoming mostly cloudy. Highs in the upper 30s. Light and variable Winds, becoming southwest around 5 Mph this afternoon.

Tonight 8 Jan Prairie

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the lower 20s. West wind 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grant Reservoir Temperature Statistics

January Temperature

Miles City, Frank Wiley Field Airport (32.3 miles)

  • Lowest 1 January, 2026

    21.9 °F

  • Average January

    31.6 °F

  • Highest 4 January, 2026

    54 °F

Climate (2021–Present)

Miles City, Frank Wiley Field Airport (32.3 miles)

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  • Average Low 2021–2026

    35.6 °F

  • Average 2021–2026

    47.6 °F

  • Average High 2021–2026

    59.7 °F
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