June in Havana is the cloudiest month of the year. In June, the weather in Havana is typically hot. Average daily high temperature in June is about 30 degrees above zero. On average, Havana has 20 rainy, 8 sunny, and 2 partly cloudy days in June. The rains are usually heavy. June as well as August, September, and October is considered the most uncomfortable time to visit Havana.