June in Dongguan is the rainiest and the cloudiest month of the year. In June, the weather in Dongguan is typically hot. Average daily high temperature in June is about 29 degrees above zero. On average, Dongguan has 29 rainy and 1 sunny day in June. The rains are usually heavy. June as well as March, April, May, and July is considered the most uncomfortable time to visit Dongguan.