Gabon has a tropical climate and lies directly on the equator in the inner-tropical convergence zone. The humidity is usually between 80 and 95 percent, and temperatures are high all year round. The main rainy season lasts from the end of January to May and the small rainy season from October to the beginning of December. The dry season runs from June to September, when trade winds make the climate more pleasant. The annual precipitation is 3000 mm on the coast and 1600 to 1800 mm inland. At the coast temperatures between 26 and 27 degrees are reached and in the inland values up to 24 degrees. At night it rarely gets colder than 20 degrees.
Gabon is best visited in the dry season from June to September and in December or January. In addition to a lack of rainfall, the temperatures are lower and the humidity is not quite as high. Nevertheless one should plan the first days of the journey to get used to the humid hot tropical climate. Between July and September is the best period for whale watching. The egg laying of the turtles takes place in the short dry season from mid-December to mid-January.