July in Porto-Novo is the rainiest and the cloudiest month of the year. In July, the weather in Porto-Novo is typically warm. Average daily high temperature in July is about 27 degrees above zero. On average, Porto-Novo has 29 rainy and 2 cloudy days in July. The rains are usually heavy. July as well as March, April, May, and June is considered the most uncomfortable time to visit Porto-Novo.