May in Antsiranana averages a daily high of 31.5°C with nights around 21.6°C. Expect roughly 5 wet days totalling 10.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Antsiranana is June–August.
Based on ANTSIRANANA, MA (3.7km), 1995–2024. 26 years of May data.