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