Nagashima, Japan offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Nagashima, Kyushu, Japan, is known for Nagashima Spa Land and the Nagashima Resort. The best time to travel to Nagashima, Japan, is in late spring (May), when the average air temperature is around 20°C (68°F) and the water temperature is approximately 18°C (64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!