August in Yeosu is the warmest month of the year. In August, the weather in Yeosu is typically hot. Average daily high temperature in August is about 27 degrees above zero. On average, Yeosu has 14 rainy, 11 sunny, 5 partly cloudy, and 1 cloudy day in August. The rains are usually heavy. August as well as January and July is considered the most uncomfortable time to visit Yeosu.