August in Thanh Hoa is the rainiest and the cloudiest month of the year. In August, the weather in Thanh Hoa is typically hot. Average daily high temperature in August is about 32 degrees above zero. On average, Thanh Hoa has 23 rainy, 7 cloudy, and 1 partly 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 Thanh Hoa.