Rapid Valley Weather Forecast

    • 54
    • 71

    Rain Showers Likely

    • 55
    • 88

    Slight Chance Thunderstorms

    • 52
    • 77

    Chance Rain Showers

    • 49
    • 73

    Chance Thunderstorms

    • 48
    • 74

    Slight Chance Thunderstorms

    • 50
    • 74

    Partly Sunny

Today 14 Sep Rapid City

Cloudy with a chance of Showers and Thunderstorms. Highs around 70. North Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 50 percent.

Tonight 14 Sep Rapid City

Cloudy with a slight chance of Showers in the Evening, then partly cloudy after midnight. Lows in the mid 50s. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rapid Valley Temperature Statistics

September Temperature

Rapid City, Rapid City Regional Airport (4.3 miles)

  • Lowest 6 September, 2025

    33.1 °F

  • Average September

    67.3 °F

  • Highest 11 September, 2025

    99 °F

Climate (2020–Present)

Rapid City, Rapid City Regional Airport (4.3 miles)

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  • Average Low 2020–2025

    35.3 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    62.2 °F
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