Saint Helena, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Saint Helena, South Carolina, United States, is known for the Penn Center, one of the first schools for formerly enslaved individuals in the United States. The best time to travel to Saint Helena, United States, is from May to October, with average air temperatures around 70-85°F and water temperatures in nearby lakes or rivers around 60-70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!