July in Khon Kaen is the rainiest month of the year. In July, the weather in Khon Kaen is typically hot. Average daily high temperature in July is about 30 degrees above zero. On average, Khon Kaen has 30 rainy and 1 cloudy day in July. The rains are usually heavy. July as well as May, June, August, and September is considered the most uncomfortable time to visit Khon Kaen.