Maunabo, United States offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Maunabo is known for the Punta Tuna Lighthouse and its picturesque beaches. The best time to travel to Maunabo, United States, is from December to April, with average air temperatures around 75-85°F (24-29°C) and water temperatures near 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!