Rapid City Weather Forecast

    • 48
    • 65

    Chance Rain Showers

    • 50
    • 72

    Partly Sunny

    • 54
    • 79

    Mostly Sunny

    • 53
    • 83

    Mostly Sunny

    • 49
    • 70

    Slight Chance Rain Showers

    • 49
    • 75

    Mostly Sunny

Today 18 Sep Rapid City

Patchy fog this morning. Cloudy with isolated Showers this Morning, then partly cloudy this afternoon. Highs in the mid 60s. North Winds 10 to 15 Mph. Chance of rain 20 percent.

Tonight 18 Sep Rapid City

Partly cloudy. A chance of Showers after midnight. Patchy fog after midnight. Lows in the mid 40s. Northeast Winds 5 to 10 Mph, becoming southwest after midnight. Chance of rain 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rapid City Temperature Statistics

September Temperature

Ellsworth Air Force Base (8.1 miles)

  • Lowest 6 September, 2025

    40.5 °F

  • Average September

    67.1 °F

  • Highest 11 September, 2025

    95 °F

Climate (2020–Present)

Ellsworth Air Force Base (8.1 miles)

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  • Average Low 2020–2025

    37.5 °F

  • Average 2020–2025

    49 °F

  • Average High 2020–2025

    60.7 °F
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