Weather will likely play an important role when you plan your trip to Antalaha, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually December and January with an average temp of 79°F, while the coldest months are August and July with an average of 72°F. The rainiest months in Antalaha are January, March, February, and December, with each month seeing an average of 11 inches of rainfall.