Duga Luka, Croatia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Duga Luka, Istria, Croatia, is known for its proximity to the scenic Ucka Nature Park and the historic town of Labin. The best time to travel to Duga Luka, Croatia, is from June to September, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 73°F (23°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!