Planning for the weather is a good way to make your trip to Mahavelona relaxing and enjoyable, especially when you’re splurging. The hottest months are usually January and February with an average temp of 79°F, while the coldest months are July and August with an average of 71°F. The rainiest months in Mahavelona are March, January, February, and April, with each month seeing an average of 15 inches of rainfall.