Shin onsen, Japan offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Shin onsen, Kansai, Japan, is known for its Kinosaki Onsen, a historic hot spring town with traditional ryokan inns and picturesque streets. The best time to visit Shin Onsen, Japan, is from April to June when the average air temperature is around 15-25°C (59-77°F) and the water temperature in the hot springs is typically around 40°C (104°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!