Planning for the weather is a good way to make your trip to Rimatara Island relaxing and enjoyable, especially when you're splurging. The hottest months are usually February and March, with an average temperature of 26°C, while the coldest months are August and September, with an average of 22°C. The rainiest months in Rimatara Island are February, March, December and January, with each month seeing an average of 226 mm of rainfall.