September in Mahajanga is the windiest month of the year. In September, the weather in Mahajanga is typically hot. Average daily high temperature in September is about 28 degrees above zero. On average, Mahajanga has 28 sunny, 1 rainy, and 1 partly cloudy day in September. The rains are usually light. September as well as June, July, and August is considered the most comfortable time to visit Mahajanga.