August in Hengchun is the rainiest month of the year. In August, the weather in Hengchun is typically hot. Average daily high temperature in August is about 28 degrees above zero. On average, Hengchun has 22 rainy, 6 sunny, and 3 partly cloudy days in August. The rains are usually heavy. August as well as May, June, July, and September is considered the most uncomfortable time to visit Hengchun.