April in Khon Kaen is the hottest month of the year. In April, the weather in Khon Kaen is typically hot. Average daily high temperature in April is about 36 degrees above zero. On average, Khon Kaen has 12 rainy, 12 sunny, 5 partly cloudy, and 1 cloudy day in April. The rains are usually heavy. April as well as May, June, July, and August is considered the most uncomfortable time to visit Khon Kaen.