Hot Springs, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Hot Springs, South Dakota, United States, is known for the Mammoth Site and Evans Plunge Mineral Springs. The best time to visit Hot Springs, United States, is in the spring (April to May) when the average air temperature is around 70°F (21°C) and the water temperature in the hot springs is typically around 100°F (38°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!