Potirna, Croatia offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Potirna, Dubrovnik Neretva, Croatia, is known for its proximity to the beautiful Korcula Island and its scenic Adriatic coastline. The best time to travel to Potirna, Croatia, is from June to September, with average air temperatures around 75°F (24°C) and water temperatures about 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!