August in Namyangju is the hottest month of the year. In August, the weather in Namyangju is typically hot. Average daily high temperature in August is about 29 degrees above zero. On average, Namyangju has 16 rainy, 7 partly cloudy, 4 sunny, and 4 cloudy days in August. The rains are usually heavy. August as well as January, February, July, and December is considered the most uncomfortable time to visit Namyangju.