June in Chiang Rai is the rainiest and the cloudiest month of the year. In June, the weather in Chiang Rai is typically hot. Average daily high temperature in June is about 28 degrees above zero. On average, Chiang Rai 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 Chiang Rai.