Shosambetsu, Japan offers 1 beach perfect for sunbathing, surfing, swimming, and more. Shosambetsu is known for the Shosambetsu Astronomical Observatory, which offers stunning views of the night sky. The best time to travel to Shosambetsu, Japan, is in August when the average air temperature is around 22°C (72°F) and the water temperature is approximately 20°C (68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!