Weather is probably a major factor when you plan your trip to Atata 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 80°F, while the coldest months are August and September with an average of 73°F. The rainiest months in Atata Island are February, March, January, and April, with each month seeing an average of 11 inches of rainfall.