August in Xiamen is the hottest month of the year. In August, the weather in Xiamen is typically hot. Average daily high temperature in August is about 30 degrees above zero. On average, Xiamen has 22 rainy, 7 sunny, 1 cloudy, and 1 partly cloudy day in August. The rains are usually heavy. August as well as May, June, July, and September is considered the most uncomfortable time to visit Xiamen.