March in Port-au-Prince is the coldest month of the year. In March, the weather in Port-au-Prince is typically warm. Average daily high temperature in March is about 26 degrees above zero. On average, Port-au-Prince has 21 rainy, 7 sunny, and 3 partly cloudy days in March. The rains are usually heavy. March as well as April, May, June, and July is considered the most uncomfortable time to visit Port-au-Prince.