Planning for the weather is a good way to make your trip to Nendaz relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August with an average temp of 58°F, while the coldest months are January and February with an average of 28°F. The rainiest months in Nendaz are May, July, December, and August, with each month seeing an average of 7 inches of rainfall.