Chamberlain, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Chamberlain, South Dakota, United States, is known for the Dignity Statue and the Akta Lakota Museum. The best time to travel to Chamberlain, United States, is in late spring or early fall when the average air temperature is around 60-70°F and the Missouri River water temperature is approximately 55-65°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!