In August, Sioux Falls typically sees daytime highs of 28.5°C and overnight lows around 14.8°C. Compared to the annual average high of 13.7°C, August runs +14.7°C.
August in Sioux Falls averages a daytime high of 28.5°C and an overnight low of 14.8°C.
August runs +14.7°C compared to Sioux Falls's annual average high of 13.7°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 28.5°C and cooler evenings around 14.8°C.