What will the weather be like?
In late August, Sioux Falls experiences warm weather with average daytime highs around 83 degree F and nighttime lows near 61 degree F. The average monthly precipitation is about 94 mm (3.7) inches over 10 rainy days, with the end of the month tending to be slightly drier than the beginning. It is generally moderately humid with an average relative humidity of around 68%.