Planning for the weather is a good way to make your trip to Antsiranana relaxing and enjoyable, especially when you're splurging. The hottest months are usually December and November with an average temp of 79°F, while the coldest months are August and July with an average of 75°F. The rainiest months in Antsiranana are January, February, March, and December, with each month seeing an average of 9 inches of rainfall.