Imlay Weather Forecast

    • 57
    • 81

    Chance Thunderstorms

    • 51
    • 73

    Mostly Cloudy

    • 46
    • 75

    Partly Sunny

    • 46
    • 64

    Mostly Sunny

    • 50
    • 73

    Mostly Sunny

    • 47
    • 72

    Partly Sunny

Today 28 Sep Pennington Co Plains

Mostly cloudy with a chance of Showers. A chance of Thunderstorms this afternoon. Highs around 80. South Winds 10 to 15 Mph with Gusts up to 35 Mph. Chance of rain 50 percent.

Tonight 28 Sep Pennington Co Plains

Mostly cloudy with a chance of Showers. A chance of Thunderstorms in the Evening, then a slight chance of Thunderstorms after midnight. Lows in the upper 50s. East Winds 10 to 15 Mph, becoming northwest 5 to 10 Mph after midnight. Chance of rain 50 percent.

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Imlay Temperature Statistics

September Temperature

Rapid City, Rapid City Regional Airport (39.8 miles)

  • Lowest 15 September, 2026

    41.6 °F

  • Average September

    67.2 °F

  • Highest 4 September, 2026

    97.6 °F

Climate (2021–2026)

Rapid City, Rapid City Regional Airport (39.8 miles)

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  • Average Low 2021–2026

    35.8 °F

  • Average 2021–2026

    49.5 °F

  • Average High 2021–2026

    63.3 °F
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