Grand Marais, United States offers 21 beaches perfect for sunbathing, surfing, swimming, and more. Grand Marais is known for the Boundary Waters Canoe Area Wilderness and the North House Folk School. The best time to travel to Grand Marais, United States, is in July when the average air temperature is around 70°F (21°C) and the average water temperature is approximately 60°F (16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!