May in Port-au-Prince is the rainiest and the cloudiest month of the year. In May, the weather in Port-au-Prince is typically hot. Average daily high temperature in May is about 28 degrees above zero. On average, Port-au-Prince has 13 rainy, 10 sunny, 6 partly cloudy, and 2 cloudy days in May. The rains are usually moderate. May as well as September and October is considered the most uncomfortable time to visit Port-au-Prince.