Weather is probably a major factor when you plan your trip to Antsirabe, but bear 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 temperature of 18°C, while the coldest months are July and June, with an average of 13°C. The rainiest months in Antsirabe are January, February, December and March, with each month seeing an average of 350 mm of rainfall.