February in Rapid City is the snowiest month of the year. In February, the weather in Rapid City is typically freezing. Average daily high temperature in February is about zero. On average, Rapid City has 13 partly cloudy, 7 sunny, 6 snowy, 2 cloudy, and 1 rainy day in February. The snowfalls are usually light. February as well as March, April, and May is considered the most uncomfortable time to visit Rapid City.