March in Cotonou is the hottest month of the year. In March, the weather in Cotonou is typically hot. Average daily high temperature in March is about 31 degrees above zero. On average, Cotonou has 17 rainy, 7 partly cloudy, 4 sunny, and 3 cloudy days in March. The rains are usually moderate. March as well as April, May, June, and July is considered the most uncomfortable time to visit Cotonou.