Weather is probably a major factor when you plan your trip to Tau Island, and keep 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 temp of 82°F, while the coldest months are August and July with an average of 80°F. The rainiest months in Tau Island are February, January, December, and November, with each month seeing an average of 13 inches of rainfall.