August in Uthai Thani is the rainiest month of the year. In August, the weather in Uthai Thani is typically hot. Average daily high temperature in August is about 31 degrees above zero. On average, Uthai Thani has 31 rainy 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 Uthai Thani.