In August, Rapid City typically sees daytime highs of 29.6°C and overnight lows around 13.4°C. Compared to the annual average high of 15.6°C, August runs +14.0°C.
August in Rapid City averages a daytime high of 29.6°C and an overnight low of 13.4°C.
August runs +14.0°C compared to Rapid City's annual average high of 15.6°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 29.6°C and cooler evenings around 13.4°C.