Perfect weather for traveling: warm, dry and sunny days. The lemurs and other indigenous wildlife are out in force, including Humpback Whales around Ile St. Marie. A very busy time as well, as Europe enjoys its school holidays, so book early.
A time of downpours, interspersed with bright sunny days. April to June is the period just after cyclone/rainy season, making the landscape lush and bountiful. A great time for wildlife spotting. October is when the vibrantly purple jacarandas bloom. December is busy due to holidays, especially over Christmas.
This is cyclone season, when most hotels and activities shut shop. A time of storms and excessive rains, so best avoid traveling at this time.