August in Beihai is the rainiest and the cloudiest month of the year. In August, the weather in Beihai is typically hot. Average daily high temperature in August is about 29 degrees above zero. On average, Beihai has 26 rainy, 2 sunny, 2 partly cloudy, and 1 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 Beihai.