Yamato, Japan offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Yamato, Kyushu, Japan, is known for the Kumamoto Castle and the Suizenji Jojuen Garden. The best time to travel to Yamato, Japan, is in April when the average air temperature is around 15°C (59°F) and the water temperature is approximately 14°C (57°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!