Key Summary- Senegal’s climate spans three Köppen zones: hot desert (BWh) in the far north, hot semi-arid (BSh) across the centre, and tropical savanna (Aw) in the south.
- A single rainy season from June to October delivers almost all annual rainfall, with totals surging from scant millimetres in the north to well over 1,500 mm in the lush Casamance region.
- The long dry season from November to May brings the dusty Harmattan wind and cooler coastal temperatures, offering the most comfortable conditions for travel.
Senegal’s position at the western bulge of Africa creates a climate that shifts from the Sahara’s fringe to the northern edge of the Guinean tropics. Our Köppen climate classification map shows three distinct bands running roughly east to west. In the far north, near the Senegal River, a narrow hot desert zone (BWh) receives negligible rain all year. A much wider hot semi-arid belt (BSh) covers the central Sahelian plains, where nine-month dry spells are normal. South of the Gambia River, tropical savanna (Aw) takes hold, marked by a pronounced wet season and dense vegetation. This pattern is governed by the seasonal migration of the Intertropical Convergence Zone. When it pushes northward, moist monsoon air feeds thunderstorms; when it retreats, dry Saharan air dominates.
Geography adds important nuance. The cool Canary Current moderates coastal temperatures, so Dakar typically records 18°C to 30°C (64°F to 86°F) while inland Tambacounda can soar above 40°C (104°F) in the hottest weeks. During the dry season, the Harmattan wind carries fine Saharan dust, softening the light into hazy sunsets over landmarks like the rose-tinted waters of Lac Rose. In the south, the tropical rainfall arrives in fierce but brief storms from July to September, transforming Casamance into a vibrant tapestry of flooded rice paddies, mangroves, and gallery forests, ideal for glimpsing dazzling birdlife. The sun-scorched dunes of the Lompoul Desert, by contrast, stay almost rainless year-round. High humidity builds along the coast during the wet season, making nights feel heavy, while the dry months bring more breathable air and clearer skies.
For most visitors, the optimal travel window is the core dry season from November to March, when low humidity and steady temperatures make exploring enjoyable. This is the favoured time for wandering the colonial streets of Saint-Louis, relaxing on the beaches of Cap Skirring, or watching migratory birds fill the wetlands of Djoudj National Bird Sanctuary. The rainy months of July to September often hamper movement with flooded tracks and stifling heat, yet they also drape the south in a deep green calm and shrink crowd sizes. Packing should follow the calendar: light, breathable fabrics, a wide-brimmed hat, and strong sun protection are wise year-round. A raincoat is worth carrying for the wet season, and a light sweater helps on cool coastal evenings in December and January. Senegal’s climate is defined by sharp contrasts, from arid northern dunes to rain-soaked southern forests, with a long dry spell that eases travel across the country. We provide detailed monthly data and interactive Köppen maps on WeatherBox to help you choose a window that matches your curiosity and comfort.
