August in Chongjin is the warmest month of the year. In August, the weather in Chongjin is typically warm. Average daily high temperature in August is about 23 degrees above zero. On average, Chongjin has 15 partly cloudy, 10 sunny, 4 rainy, and 2 cloudy days in August. The rains are usually heavy. August as well as September is considered the most comfortable time to visit Chongjin.