June in Cancun is the cloudiest month of the year. In June, the weather in Cancun is typically hot. Average daily high temperature in June is about 29 degrees above zero. On average, Cancun has 21 rainy, 4 cloudy, 3 partly cloudy, and 2 sunny days in June. The rains are usually heavy. June as well as July, August, September, and October is considered the most uncomfortable time to visit Cancun.