August in Muan is the hottest month of the year. In August, the weather in Muan is typically hot. Average daily high temperature in August is about 28 degrees above zero. On average, Muan has 14 rainy, 12 sunny, 4 partly cloudy, and 1 cloudy day in August. The rains are usually heavy. August as well as January, February, July, and December is considered the most uncomfortable time to visit Muan.