Gradina, Croatia offers 15 beaches perfect for sunbathing, surfing, swimming, and more. Gradina, Dubrovnik Neretva, Croatia, is known for its proximity to the ancient city of Dubrovnik, a UNESCO World Heritage Site famous for its well-preserved medieval architecture and stunning Adriatic Sea views. The best time to travel to Gradina, Croatia, is from June to September, when the average air temperature is around 75°F (24°C) and the sea temperature is approximately 77°F (25°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!