ギニア

• Guinea spans tropical monsoon (Am) and tropical savanna (Aw) climates, creating a sharp divide between a rain-drenched coastline and a seasonally parched interior.
• The Fouta Djallon highlands act as a climatic crossroads, pulling moisture from the Atlantic while offering noticeably cooler highland temperatures compared to the steamy lowlands.
• A single dominant dry season from November to April contrasts with a long, drenching wet season, shaping everything from road conditions to wildlife viewing.

Bordered by the Atlantic and sitting between 7° and 12° north, Guinea’s climate is a story of wet and dry, governed by the migrating Intertropical Convergence Zone. The country divides cleanly under the Köppen climate classification. A tropical monsoon (Am) zone dominates the coast, the capital Conakry, and the densely forested southeast. This narrow band receives persistent, heavy rainfall with a brief dry interlude, keeping humidity stubbornly high year-round. Moving inland, the landscape transitions into tropical savanna (Aw) territory, covering the vast northeastern plains and the Upper Guinea region, where a pronounced dry season takes hold. Geography sharpens these differences. The Fouta Djallon massif, a plateau jutting over 1,500 metres in the centre-west, orographically wrings out monsoon moisture, feeding West Africa’s major rivers while creating patches of milder temperatures uncommon for the latitude.

For the traveller, Guinea’s regional contrasts matter. The coastal stretch around Conakry and the mangrove-lined estuaries experiences intense tropical rainfall from May through October, with monthly totals sometimes exceeding 1,000 mm (39 inches) during peak monsoon months. Heat and humidity stay elevated, with temperatures typically ranging from 24°C to 32°C (75°F to 90°F). The southeastern forest region near Mount Nimba mirrors this soupy pattern, making light waterproof layers essential. By contrast, the Fouta Djallon highlands around Labé and Dalaba offer a reprieve. Here, cooler highland air often sees daytime highs of 20°C to 28°C (68°F to 82°F) and nights dropping near 15°C (59°F), with misty mornings drifting across scenic plateaus and waterfalls. Farther northeast, in the savanna stretching toward the Malian border, the dry season dominates. From November to February, the dusty Harmattan wind sweeps in from the Sahara, cutting humidity but hazing the skies. Daytime temperatures hover around 30°C (86°F) while nights can dip to a surprisingly crisp 16°C to 18°C (60°F to 64°F). Rainfall here is markedly lower, with annual totals dropping to roughly 1,200 to 1,500 mm (47 to 59 inches), concentrated almost entirely between June and September.

Dry season months from November to April deliver the most favourable travel conditions for most of Guinea. December through February, in particular, balances lower humidity, reduced mosquito activity, and firm roads that make overland journeys between Conakry and the highlands far easier. This is an ideal window for visiting the sweeping vistas of the Fouta Djallon or for wildlife spotting in the dry savanna, where clearer skies and thinned vegetation improve visibility. The wet season, stretching May to October, transforms the country into a lush, emerald landscape and can appeal to visitors drawn to dramatic skies and full waterfalls. However, heavy downpours regularly wash out unpaved routes and can stall interior travel. Packing with Guinea’s dual character in mind helps. In the coastal and forest zones, lightweight, breathable fabrics, sturdy rain gear, and reliable sun protection work year-round. If heading to the highlands, add a light fleece or jacket for cooler evenings under the Harmattan. For savanna regions during the dry months, a scarf or buff helps with occasional dust. We encourage you to explore WeatherBox’s detailed monthly charts and maps, where you can compare temperature and rainfall patterns for Conakry, Labé, Kankan, and beyond to fine-tune your itinerary around Guinea’s dramatic seasonal rhythms.