May in Kuba is the rainiest month of the year. In May, the weather in Kuba is typically warm. Average daily high temperature in May is about 20 degrees above zero. On average, Kuba has 15 rainy, 8 sunny, 6 partly cloudy, and 2 cloudy days in May. The rains are usually heavy. May as well as January, February, March, and April is considered the most uncomfortable time to visit Kuba.