Taking the local weather in Nuku'alofa into account can help you maximise your time at the pool during your trip. The hottest months are usually February and March, with an average temperature of 27°C, while the coldest months are August and September, with an average of 23°C. The rainiest months in Nuku'alofa are February, March, January and April, with each month seeing an average of 291 mm of rainfall.