Slates Hot Springs, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Slates Hot Springs, California, United States, is known for the Esalen Institute, a renowned retreat center offering workshops and hot springs with stunning views of the Pacific Ocean. The best time to visit Slates Hot Springs is during late spring to early fall, with average air temperatures ranging from 60-75°F and water temperatures around 100-104°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!