Guinea is one of the wettest countries in West Africa – Conakry receives over 4300mm of rain a year, half of it in July and August. Temperatures average 30°C along the coast, where it is always humid, and can fall to 6°C and below at night in the Fouta Djalon in December and January.
The best time to visit is November and December, after the rains and before the dusty harmattan winds, though the Fouta Djalon is at its greenest and best during the rainy season.
April is very hot everywhere and is not a pleasant month to travel in Guinea.
Many roads turn into mud rivers and are almost impassable during the rainy season. Avoid!