Weather will likely play an important role when you plan your trip to Île Boulay, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually February and April with an average temp of 83°F, while the coldest months are August and July with an average of 78°F. The rainiest months in Île Boulay are June, May, October, and July, with each month seeing an average of 13 inches of rainfall.