Summer in Rapid City has relatively pleasant temperatures, and is relatively dry, and relatively sunny. July is the warmest month of the year, having a daily average temperature of . An average of 34 days reach + highs and 5.1 with + highs. Due to the elevation and aridity, lows rarely remain at or above and during July and August fall to or below on an average 7.6 days. Rapid City records an average of nine thunderstorm days in August, but only of rain in that month.