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