Weather is probably a major factor when you plan your trip to Ambatolampy, 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 64°F, while the coldest months are July and June with an average of 55°F. The rainiest months in Ambatolampy are January, February, December, and March, with each month seeing an average of 14 inches of rainfall.