In May, the weather in Port-Gentil is typically hot. Average daily high temperature in May is about 28 degrees above zero. On average, Port-Gentil has 19 rainy, 10 cloudy, 1 sunny, and 1 partly cloudy day in May. The rains are usually heavy. May as well as January, February, March, and April is considered the most uncomfortable time to visit Port-Gentil.