Madagascar’s climate is as layered as its ecosystems, a product of its size, its position in the Indian Ocean, and the steady push of trade winds across its eastern ridges. The island stretches between roughly 12°S and 26°S, sitting in the path of seasonal shifting winds that bring moisture in the summer and drier patterns in the winter. Because of this, the country is usually split into a wet season on the east and a more pronounced dry season across the west and south, with altitude adding another sharp gradient to temperature and rainfall.
East Coast and the Trade Wind Belt
Along the east coast, the climate is shaped by persistent southeast trade winds that rise against the Toamasina and Fanolena mountain barriers. This uplift fuels high rainfall, often exceeding two meters in some areas each year, and keeps temperatures moderated by the ocean. The result is a hot and humid environment where rain can arrive in almost any month, though a slightly wetter stretch typically aligns with the southern summer months. Dense rainforests, swift rivers, and frequent cyclones from the Australian basin define this strip of coastline.
Central Highlands and Altitude Effects
Moving inland toward the central highlands, the climate shifts quickly with elevation. Antananarivo and surrounding towns enjoy milder conditions, with daytime temperatures often sitting comfortably in the low twenties Celsius even at the height of the warm season. Nights can be cool, especially in the austral winter, and fires for cooking and warmth are common in rural villages. Rainfall here is still substantial, but it is more clearly seasonal, with a marked dry period from about May to October when skies are clearer and dust can hang over the valleys.
West and South: The Dry Leeward Zone
West of the highlands, the air descends, warming and drying as it flows toward the Mozambique Channel and the southern tip of the island. Mahajanga and the western plains see a pronounced dry season, with long stretches of cloudless skies and sparse, erratic rain. Further south, in regions around Toliara, semi-arid conditions take hold, where vegetation is thorny and adapted to long gaps without water. Summer temperatures here can climb sharply, while winter evenings are often crisp and clear.
Cyclones and Rainfall Variability
From November to April, the Indian Ocean can spawn powerful cyclones that track toward Madagascar, especially in the northwest and east. These systems bring torrential rain, storm surges, and destructive winds that can erase roads, damage crops, and displace communities in a single event. Year to year, the timing and number of cyclones fluctuate with broader climate patterns such as the Indian Ocean Dipole and El Niño–Southern Oscillation. A positive phase of the Indian Ocean Dipole, for example, can enhance rainfall on the east while suppressing it in the south, sharpening the contrasts that travelers and planners must consider.
