Weather is probably a major factor when you plan your trip to Raiatea, but bear in mind that cheaper options are usually available when the weather isn’t as good. The hottest months are usually March and April, with an average temperature of 27°C, while the coldest months are August and September, with an average of 25°C. The rainiest months in Raiatea are January, February, December and November, with each month seeing an average of 283 mm of rainfall.