December in Port-Gentil is the sunniest month of the year. In December, the weather in Port-Gentil is typically warm. Average daily high temperature in December is about 27 degrees above zero. On average, Port-Gentil has 26 rainy and 5 sunny days in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Port-Gentil.