May in Suphan Buri is the cloudiest month of the year. In May, the weather in Suphan Buri is typically hot. Average daily high temperature in May is about 33 degrees above zero. On average, Suphan Buri has 27 rainy and 4 cloudy days in May. The rains are usually heavy. May as well as April, June, July, and August is considered the most uncomfortable time to visit Suphan Buri.