Weather is probably a major factor when you plan your trip to Antananarivo, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually November and October with an average temp of 68°F, while the coldest months are July and August with an average of 59°F. The rainiest months in Antananarivo are January, February, December, and March, with each month seeing an average of 12 inches of rainfall.