Weather is probably a major factor when you plan your trip to Ambalavao, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually November and December with an average temp of 68°F, while the coldest months are July and August with an average of 58°F. The rainiest months in Ambalavao are January, December, February, and March, with each month seeing an average of 11 inches of rainfall.