Peterborg, United States Virgin Islands offers 1 beach perfect for sunbathing, surfing, swimming, and more. Peterborg, Saint Thomas, United States Virgin Islands, is known for its stunning views from Drake's Seat and the luxurious Magens Bay Beach. The best time to travel to Peterborg, United States Virgin Islands, is from December to April, with average air temperatures around 77-82°F (25-28°C) and water temperatures around 79-82°F (26-28°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!