Saint Donat, Canada offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Saint Donat is known for Mont-Tremblant National Park and Lac Archambault. The best time to travel to Saint Donat, Canada, is during the summer months of June to August, when the average air temperature is around 20-25°C (68-77°F) and water temperature in the lakes is approximately 20°C (68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!