In April, Sioux City typically sees daytime highs of 16.9°C and overnight lows around 2.6°C. Compared to the annual average high of 15.8°C, April runs +1.2°C.
April in Sioux City averages a daytime high of 16.9°C and an overnight low of 2.6°C.
April runs +1.2°C compared to Sioux City's annual average high of 15.8°C, ranking #7 of 12 months by warmth.
Plan for daytime highs near 16.9°C and cooler evenings around 2.6°C.