Mammoth Lakes, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Mammoth Lakes is known for its stunning alpine lakes and proximity to world-class skiing and hiking. The best time to travel to Mammoth Lakes is from June to September, with average air temperatures ranging from 50°F to 80°F and water temperatures in nearby lakes around 60°F to 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!