Nagasaki, Japan offers 9 beaches perfect for sunbathing, surfing, swimming, and more. Nagasaki is known for its historic sites such as the Nagasaki Peace Park, Glover Garden, and Dejima. The best time to travel to Nagasaki, Japan, is in April when the average air temperature is around 18°C (64°F) and the water temperature is approximately 17°C (63°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!