Weather is probably a major factor when you plan your trip to Noirmoutier-en-l'Ile, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August, with an average temperature of 18°C, while the coldest months are February and January, with an average of 8°C. Average annual precipitation for Noirmoutier-en-l'Ile is 760 mm.