Duba Stonska, Croatia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Duba Stonska, Dubrovnik Neretva, Croatia, is known for its proximity to the historic Walls of Ston and the Ston Saltworks. The best time to travel to Duba Stonska, Croatia, is from June to September, when the average air temperature is around 25°C (77°F) and the sea temperature is approximately 24°C (75°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!