Weather is probably a major factor when you plan your trip to Marovoay, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually October and November with an average temp of 81°F, while the coldest months are July and August with an average of 77°F. The rainiest months in Marovoay are January, February, March, and December, with each month seeing an average of 13 inches of rainfall.