La Grande Princesse, United States Virgin Islands offers 1 beach perfect for sunbathing, surfing, swimming, and more. La Grande Princesse is known for the Salt River Bay National Historical Park and Ecological Preserve. The best time to travel to La Grande Princesse, United States Virgin Islands, is from December to April, with average air temperatures around 77-82°F and water temperatures about 79-82°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!