January weather forecast in Fort Mill

January in Fort Mill is the coldest month of the year. In January, the weather in Fort Mill is typically warm. Average daily high temperature in January is about 11 degrees above zero. On average, Fort Mill has 12 sunny, 8 rainy, 8 partly cloudy, and 3 cloudy days in January. The rains are usually heavy. January as well as February, June, July, and August is considered the most uncomfortable time to visit Fort Mill.