Nyuzen, Japan offers 1 beach perfect for sunbathing, surfing, swimming, and more. Nyuzen is known for the Nyuzen Hotaru Firefly Festival, which celebrates the natural beauty of fireflies in the region. The best time to travel to Nyuzen, Japan, is in late spring (May), when the average air temperature is around 18°C (64°F) and the water temperature is approximately 16°C (61°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!