Grant Reservoir Weather Forecast

    • 53
    • 80

    Rain Showers Likely

    • 49
    • 71

    Chance Rain Showers

    • 50
    • 70

    Chance Rain Showers

    • 52
    • 75

    Mostly Sunny

    • 55
    • 82

    Slight Chance Thunderstorms

    • 59
    • 88

    Slight Chance Thunderstorms

Today 27 Jun Prairie

Partly sunny. A chance of Thunderstorms this afternoon. Some Thunderstorms may be severe with damaging Winds and large hail. Highs in the lower 80s. Northeast wind 5 to 10 Mph, becoming west this afternoon. Chance of precipitation 40 percent.

Tonight 27 Jun Prairie

Showers likely with a chance of Thunderstorms in the Evening, then a chance of Showers after midnight. Some Thunderstorms may be severe with damaging Winds and large hail. Lows in the mid 50s. West wind 5 to 10 Mph, becoming southwest after midnight. Chance of rain 60 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grant Reservoir Temperature Statistics

June Temperature

Miles City, Frank Wiley Field Airport (32.3 miles)

  • Lowest 14 June, 2026

    41.6 °F

  • Average June

    63.1 °F

  • Highest 6 June, 2026

    93.7 °F

Climate (2021–2026)

Miles City, Frank Wiley Field Airport (32.3 miles)

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  • Average Low 2021–2026

    35.8 °F

  • Average 2021–2026

    47.9 °F

  • Average High 2021–2026

    60.1 °F
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