Roy City Park Weather Forecast

    • 55
    • 75

    Rain Showers Likely

    • 55
    • 75

    Chance Rain Showers

    • 56
    • 75

    Chance Rain Showers

    • 55
    • 73

    Chance Rain Showers

    • 54
    • 76

    Chance Rain Showers

    • 52
    • 71

    Chance Rain Showers

Today 11 Sep Fergus County below 4500ft

Mostly cloudy. Chance of rain Showers and slight chance of Thunderstorms in the Morning, then chance of Thunderstorms in the afternoon. Highs 75 to 80. West Winds up to 10 Mph shifting to the north in the afternoon. Chance of precipitation 50 percent.

Tonight 11 Sep Fergus County below 4500ft

Cooler. Mostly cloudy. Rain Showers likely and slight chance of Thunderstorms in the Evening, then chance of rain Showers and slight chance of Thunderstorms after midnight. Lows 50 to 55. West Winds up to 10 Mph. Chance of precipitation 70 percent.

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Roy City Park Temperature Statistics

September Temperature

Lewistown, Lewistown Municipal Airport (30.4 miles)

  • Lowest 5 September, 2025

    34 °F

  • Average September

    62 °F

  • Highest 2 September, 2025

    86 °F

Climate (2020–Present)

Lewistown, Lewistown Municipal Airport (30.4 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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