January in Muan is the coldest month of the year. In January, the weather in Muan is typically cold. Average daily high temperature in January is about 4 degrees above zero. On average, Muan has 15 partly cloudy, 9 sunny, 4 rainy, and 3 cloudy days in January. The rains are usually moderate. January as well as February, July, August, and December is considered the most uncomfortable time to visit Muan.