Mosquito, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Mosquito, Puerto Rico, United States, is known for its proximity to the stunning bioluminescent bay, Mosquito Bay. The best time to travel to Mosquito, United States, is during the summer months when the average air temperature is around 75°F (24°C) and the water temperature is approximately 70°F (21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!