If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Vatomandry: The hottest months are usually January and February, with an average temperature of 26°C, while the coldest months are August and July, with an average of 21°C. The rainiest months in Vatomandry are March, February, January and April, with each month seeing an average of 344 mm of rainfall.