Hamamatsu, Japan offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Hamamatsu is known for the Hamamatsu Castle, Hamamatsu Flower Park, and the Hamamatsu Museum of Musical Instruments. The best time to travel to Hamamatsu, Japan, is in 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!