Rapid Valley Weather Forecast

    • 54
    • 74

    Mostly Cloudy

    • 52
    • 77

    Mostly Sunny

    • 57
    • 77

    Chance Rain Showers

    • 51
    • 71

    Rain Showers Likely

    • 51
    • 67

    Slight Chance Rain Showers

    • 50
    • 69

    Partly Sunny

Today 25 Sep Rapid City

Partly cloudy. Highs in the lower 70s. South Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 25 Sep Rapid City

Partly cloudy. Lows in the mid 50s. South Winds 10 to 15 Mph. Gusts up to 30 Mph, decreasing to 20 Mph after midnight.

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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 15 September, 2026

    41.6 °F

  • Average September

    67.5 °F

  • Highest 4 September, 2026

    97.6 °F

Climate (2021–2026)

Rapid City, Rapid City Regional Airport (4.3 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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