Lake on the Mountain, Canada offers 1 beach perfect for sunbathing, surfing, swimming, and more. Lake on the Mountain is known for its unique natural phenomenon and scenic views. The best time to visit Lake on the Mountain, Canada, is during the summer months of June to August, when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 18-22°C (64-72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!