Planning for the weather is a good way to make your trip to Niuafo'ou relaxing and enjoyable, especially when you're splurging. The hottest months are usually February and March with an average temp of 82°F, while the coldest months are August and July with an average of 79°F. The rainiest months in Niuafo'ou are February, January, December, and March, with each month seeing an average of 16 inches of rainfall.