July in Seoul is the rainiest and the cloudiest month of the year. In July, the weather in Seoul is typically warm. Average daily high temperature in July is about 27 degrees above zero. On average, Seoul has 22 rainy, 6 sunny, 2 partly cloudy, and 1 cloudy day in July. The rains are usually heavy. July as well as February, August, and December is considered the most uncomfortable time to visit Seoul.