You can plan your beach trip with this snapshot of year-round temperatures in L'Île-des-Pins: The hottest months are usually February and March with an average temp of 78°F, while the coldest months are August and July with an average of 71°F. The rainiest months in L'Île-des-Pins are March, January, April, and February, with each month seeing an average of 7 inches of rainfall.