Find the most current and reliable 14 day weather forecasts, storm alerts, reports and information for Sioux City, IA, US with The Weather Network. South Sioux City, NE Weather Forecast | AccuWeather Current Weather 12:57 PM 60° F RealFeel® 68° RealFeel Shade™ 61° Air Quality Fair Wind E 2 mph Wind Gusts 3 mph Sunny More Details Current. South Sioux City, NE 10-Day Weather Forecast - The Weather Channel | Weather.com 10 Day Weather - South Sioux City, NE As of 3:48 pm CDT There is a marginal risk of severe.