Tosashimizu, Japan offers 9 beaches perfect for sunbathing, surfing, swimming, and more. Tosashimizu is known for Cape Ashizuri, the Ashizuri-Uwakai National Park, and the John Mung Museum. The best time to travel to Tosashimizu, Japan, is from April to June, with average air temperatures around 18-24°C (64-75°F) and water temperatures around 18-22°C (64-72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!