In May, the weather in Khon Kaen is typically hot. Average daily high temperature in May is about 34 degrees above zero. On average, Khon Kaen has 20 rainy, 4 sunny, 4 cloudy, and 3 partly 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 Khon Kaen.