August in Thanh Hoa is the rainiest month of the year. In August, the weather in Thanh Hoa is typically hot. Average daily high temperature in August is about 31 degrees above zero. On average, Thanh Hoa has 29 rainy and 2 sunny 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 Thanh Hoa.