October in Sioux City averages a daily high of 17.8°C with nights around 3.4°C. Expect roughly 7.4 wet days totalling 55mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Sioux City is September–October.
Based on SIOUX CITY AIRPORT, IA US (12.2km), 1995–2024. 30 years of October data.