Weather is probably a major factor when you plan your trip to Port Gentil, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and April with an average temp of 81°F, while the coldest months are July and August with an average of 76°F. The rainiest months in Port Gentil are November, December, October, and January, with each month seeing an average of 15 inches of rainfall.