August in Dandong is the warmest month of the year. In August, the weather in Dandong is typically warm. Average daily high temperature in August is about 26 degrees above zero. On average, Dandong has 14 rainy, 13 sunny, and 4 partly cloudy days in August. The rains are usually heavy. August as well as March, July, and November is considered the most uncomfortable time to visit Dandong.