January in Yeosu is the sunniest and the coldest month of the year. In January, the weather in Yeosu is typically cold. Average daily high temperature in January is about 4 degrees above zero. On average, Yeosu has 23 sunny, 6 partly cloudy, 1 rainy, and 1 cloudy day in January. The rains are usually light. January as well as July and August is considered the most uncomfortable time to visit Yeosu.