Summersville, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Summersville is known for Summersville Lake, the largest lake in West Virginia, which offers opportunities for boating, fishing, and rock climbing. The best time to travel to Summersville, United States, is in late spring or early fall when the average air temperature is around 70°F (21°C) and the water temperature in Summersville Lake is approximately 65°F (18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!