August in Khon Kaen is the rainiest and the cloudiest month of the year. In August, the weather in Khon Kaen is typically hot. Average daily high temperature in August is about 32 degrees above zero. On average, Khon Kaen has 24 rainy and 7 cloudy days in August. The rains are usually heavy. August as well as April, May, June, and July is considered the most uncomfortable time to visit Khon Kaen.