This page presents Guinea's climate context for the current climatology, 1991-2020, derived from observed, historical data. Information should be used to build a strong understanding of current climate conditions in order to appreciate future climate scenarios and projected change. You can visualize data for the current climatology through spatial variation, the seasonal cycle, or as a time series. Analysis is available for both annual and seasonal data. Data presentation defaults to national-scale aggregation, however sub-national data aggregations can be accessed by clicking within a country, on a sub-national unit. Other historical climatologies can be selected from the Time Period dropdown list. Data for specific coordinates can be downloaded for in the Data Download page.
Guinea is divided into two climatic zones: the tropical zone for most of the territory and the subequatorial for South East Guinea. The annual rainfall regime is uni-modal. The year is divided into two distinct seasons: a dry and a wet. The wet season takes place from May to October, followed by a dry season from November to April. Temperatures are high and constant. The country is characterized by significant climatic differences, due in large part to the variety of the relief. The sub-Guinean tropical climate in Lower Guinea has average temperatures quite constant: 23° and 25°C and significant rainfall, between 2100 and 5000 mm, with a monthly maximum of over 1000 mm in August. In the tropical mountain climate type, in Middle Guinea, the two seasons are of approximately equal duration and the rainfall varies from 1600 mm to 2000 mm.