Gambia's weather splits neatly into two seasons. Your choice of travel month dictates everything: luggage, routes, transport, and the texture of the country that greets you. The dry season stretches roughly from November through May. It is powered by the Harmattan, a warm, dusty wind that rolls south from the Sahara and steadily saps moisture from the air. Rainfall is effectively nil from December through April. Skies stay clear to hazy. The red laterite roads and peanut fields fade to pale beige as the weeks pass. Daytime temperatures sit in the low-to-mid 30s Celsius, warm yet tolerable. Nights in December and January cool sharply, dropping to around 15°C (60°F) along the coast. That swing catches newcomers off guard. You step into balmy evening air, then by midnight you are hunting for a layer you never thought you would need.
The wet season runs June through October. It peaks in August when Gambia receives around 348mm of rain in a single month. London rarely sees that in a year. What changes is not just volume but mood. The Harmattan retreats. Moist Atlantic air sweeps in, joined by southern flows. Temperatures dip slightly; August highs hover around 30°C (86°F). Humidity, however, climbs and the heat feels heavier, more persistent. The countryside flips its palette. Dry browns surrender to dense, almost shocking green. The River Gambia swells, floodplains broaden, and birds arrive in numbers that serious birdwatchers schedule around.
What sets Gambia apart from much of the West African interior is the Atlantic coastline. The resort towns of
Kololi,
Kotu, and Senegambia, plus the capital Banjul to the north, all catch coastal breezes that tame the worst of the heat. Inland, sun and humidity combine with more force. Yet most visitors stay within a few kilometres of the ocean. The sea itself becomes natural temperature control. The shoulder months, October as rains recede and November as the dry season approaches, deliver an appealing middle ground: lower prices, thinner crowds, and weather either greening up or drying out, depending on direction.