Nishio, Japan offers 9 beaches perfect for sunbathing, surfing, swimming, and more. Nishio is known for its production of high-quality matcha green tea and the historic Nishio Castle. The best time to travel to Nishio, Japan, is in April when the average air temperature is around 15°C (59°F) and the water temperature is approximately 14°C (57°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!