In October, Sioux City typically sees daytime highs of 18.8°C and overnight lows around 3.8°C. Compared to the annual average high of 15.8°C, October runs +3.0°C.
October in Sioux City averages a daytime high of 18.8°C and an overnight low of 3.8°C.
October runs +3.0°C compared to Sioux City's annual average high of 15.8°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 18.8°C and cooler evenings around 3.8°C.