October in Sioux Falls averages a daily high of 16°C with nights around 3.3°C. Expect roughly 8 wet days totalling 58.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Sioux Falls is August–September.
Based on SIOUX FALLS FOSS FIELD, SD US (4.9km), 1995–2024. 30 years of October data.