In May, the weather in Kanchanaburi is typically hot. Average daily high temperature in May is about 34 degrees above zero. On average, Kanchanaburi has 21 rainy, 6 cloudy, 3 partly cloudy, and 1 sunny day in May. The rains are usually heavy. May as well as June, July, August, and September is considered the most uncomfortable time to visit Kanchanaburi.