Yuasa, Japan offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Yuasa, Kansai, Japan, is known for its traditional soy sauce production and the historic Yuasa Soy Sauce Museum. The best time to travel to Yuasa, Japan, is in April when the average air temperature is around 15°C (59°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!