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