Minami Shimabara, Japan offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Minami Shimabara is known for the Hara Castle Ruins and the Unzen-Amakusa National Park. The best time to travel to Minami Shimabara, Japan, is from late March to early May, with average air temperatures around 15-20°C (59-68°F) and water temperatures around 16-18°C (61-64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!