In February, the weather in Sioux City is typically freezing. Average daily high temperature in February is about 1 degree below zero. On average, Sioux City has 9 cloudy, 8 partly cloudy, 7 sunny, 3 rainy, and 2 snowy days in February. The rains are usually light. February as well as March, April, November, and December is considered the most uncomfortable time to visit Sioux City.