The geographic position of Grand Kru County near the equator and proximity to the Atlantic Ocean determine the County’s climatic condition. Average annual rainfall ranges between 107 inches in the Northern part of the County to 160 inches in the Southern part. The climate is characterized by little seasonal change in temperature and humidity, but by daily changes between day and night. The seasons (dry and rainy) are marked by variation in precipitation.

The rainy season runs from April to September while the dry season spans between October and March. Generally the wind blows from the Northeast during the dry season and from the Southwest during the rainy season. Due to the equatorial location of Grand Kru County, the sun is overhead almost all the year. Average annual temperature is 25.5ºC (77.5ºF).