March in Porto-Novo is the hottest month of the year. In March, the weather in Porto-Novo is typically hot. Average daily high temperature in March is about 30 degrees above zero. On average, Porto-Novo has 20 rainy, 6 partly cloudy, 4 sunny, and 1 cloudy day in March. The rains are usually moderate. March as well as April, May, June, and July is considered the most uncomfortable time to visit Porto-Novo.