Planning for the weather is an important factor for making your trip to Petite-Ile a success, especially when you’re splurging. The hottest months are usually February and January with an average temp of 78°F, while the coldest months are July and August with an average of 70°F. The rainiest months in Petite-Ile are January, February, March, and December, with each month seeing an average of 10 inches of rainfall.