Weather is probably a major factor when you plan your trip to Pont-Saint-Martin, and keep 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 temp of 66°F, while the coldest months are January and February with an average of 38°F. The rainiest months in Pont-Saint-Martin are November, May, October, and April, with each month seeing an average of 8 inches of rainfall.