August in Nanchang is the rainiest month of the year. In August, the weather in Nanchang is typically hot. Average daily high temperature in August is about 31 degrees above zero. On average, Nanchang has 25 rainy, 5 sunny, and 1 partly cloudy day in August. The rains are usually heavy. August as well as March, June, and July is considered the most uncomfortable time to visit Nanchang.