September in Antsiranana is the windiest and the sunniest month of the year. In September, the weather in Antsiranana is typically warm. Average daily high temperature in September is about 26 degrees above zero. On average, Antsiranana has 22 sunny and 8 partly cloudy days in September. September as well as May, June, July, and August is considered the most comfortable time to visit Antsiranana.