Hannan, Japan offers 1 beach perfect for sunbathing, surfing, swimming, and more. Hannan is known for Nishikinohama Beach Park in regard to tourism. The best time to travel to Hannan, 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!