Weather is probably a major factor when you plan your trip to Tsiroanomandidy, 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 67°F, while the coldest months are July and June with an average of 59°F. The rainiest months in Tsiroanomandidy are January, February, December, and March, with each month seeing an average of 13 inches of rainfall.