roamopedia
A car on a flooded road in the Gambia during the rainy season.
Photo: Jurgen from Netherlands · Wikimedia Commons · CC BY

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The Gambia has one dry season and one wet one, not four. The dry season runs from November to May and the rainy season from June to October, and almost every practical decision about when to visit comes down to which side of that line your trip falls on.

The dry season and the harmattan

For most of the dry season, the coast stays comfortable, but March, April and May bring a change: the harmattan, a hot, dry, dusty wind off the Sahara, blows into the interior and can push temperatures there past 38°C (100°F). The coast is milder than the interior through the dry season generally, with temperatures reaching around 32°C (90°F) there. The dusty haze the harmattan carries can dull the sky and is worth knowing about if you have respiratory sensitivities or were hoping for crisp, clear days throughout.

The rainy season

Once the rains set in from June, the coast cools: temperatures there drop to around 18°C (65°F) at the cooler end of the rainy season, a wide swing from the dry-season heat. Rainfall is unpredictable from one year to the next: the country averages about 1,020 mm (40 in) of rain a year, but any given year can bring as little as 750 mm (30 in) or as much as 1,500 mm (60 in). That variability means a rainy-season trip in a wet year and one in a dry year can feel like different countries; there is no way to know in advance which kind of year you will land in.

Coast versus interior

The gap between the coast and the interior widens in the dry season and narrows in the wet one. Through the harmattan months the interior can run well past 38°C (100°F) while the coast, cooled by the Atlantic, tops out closer to 32°C (90°F); a few hours’ drive inland from the resort strip can feel like a different climate in March or April. That gap is one reason most short, beach-focused trips stay on the coast and leave the harmattan-season interior to travellers heading upriver with time to spare.

What this means for a trip

The dry season, November to May, is when most visitors come, and for good reason: no rain to plan around and, outside the harmattan months, more comfortable temperatures on the coast. The harmattan window of March to May adds dust and higher heat inland, so it suits a coast-based trip better than an upcountry one. The rainy season, June to October, brings cooler coastal temperatures but unpredictable and sometimes heavy rain; upcountry roads can turn slow or difficult to pass in a wet year, and river-based trips are more exposed to that than a coastal stay.

Timing a trip around the calendar months alone only gets you so far, since the average rainfall year to year swings between 750 mm and 1,500 mm on either side of the roughly 1,020 mm mean. A June or October visit, at the edges of the rainy season, is a reasonable compromise if you want to avoid both the harmattan dust and the heaviest of the mid-season rain, though neither month is guaranteed dry.

Practical tips

  • Favour November to May for an upcountry trip, since dry roads matter more away from the coast than on it.
  • If travelling March to May, expect dust haze from the harmattan and pack accordingly if you have breathing sensitivities.
  • A rainy-season coastal stay can still work; the trade-off is cooler temperatures and the chance of heavy, unpredictable rain rather than guaranteed washout weather.
  • Rain totals vary a lot year to year, so a single wet-season week can be drier or wetter than the average suggests.

What to check before you go

  • Recent rainfall if you are travelling upcountry in or near the rainy season, since road conditions depend on how wet that particular year has been.
  • Air quality and dust forecasts if you have respiratory concerns and are travelling during the March–May harmattan.
  • The current UK, Dutch and US government travel advisories, in the safety guide.
  • The timezone and other planning basics are in the facts box above.