A google search would have taken less time than your post - see below. They'll have plenty of time to suck dirt before the peak rain season.
The three countries of Sierra Leone, Guinea, and Liberia lie on the west coast of Africa between 4° and 12°N. All have a coastline facing southwest towards the Atlantic Ocean and include an extensive coastal plain rising inland to a plateau area where heights exceed 1,000 m/3,300 ft. This similarity of situation and relief gives them a broadly similar climate.
In this part of Africa the intertropical belt of cloud and rain migrates northwards and southwards with the apparent movement of the overhead sun but lagging behind by some four to six weeks.
From October to March, during the period of low sun, the weather is generally dry with many fine, hot, sunny days. The season of high sun, from April to September, is the rainy season. The rainfall increases to a peak in July and August and then decreases until rain has almost ceased by November.
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