Vieques, United States offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Vieques is known for Mosquito Bay, one of the brightest bioluminescent bays in the world. The best time to travel to Vieques, United States, is from December to April, with average air temperatures around 80°F (27°C) and water temperatures near 79°F (26°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!