July in Busan is the rainiest and the cloudiest month of the year. In July, the weather in Busan is typically warm. Average daily high temperature in July is about 26 degrees above zero. On average, Busan has 20 rainy, 5 sunny, 5 cloudy, and 1 partly cloudy day in July. The rains are usually heavy. July as well as January, February, and August is considered the most uncomfortable time to visit Busan.