Minnetonka, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Minnetonka is known for Lake Minnetonka, a popular destination for boating and fishing. The best time to travel to Minnetonka, United States, is during the summer months of June to August, when the average air temperature is around 70-80°F and the water temperature in Lake Minnetonka is approximately 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!