March in Porto-Novo is the windiest month of the year. In March, the weather in Porto-Novo is typically hot. Average daily high temperature in March is about 31 degrees above zero. On average, Porto-Novo has 23 rainy, 5 sunny, 2 partly cloudy, 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.