Weather will likely play an important role when you plan your trip to Wayasewa Island, and keep in mind that cheaper options are usually available when the weather isn't as good. 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 78°F. The rainiest months in Wayasewa Island are March, February, January, and December, with each month seeing an average of 15 inches of rainfall.