Duba, Croatia offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Duba, Istria, Croatia, is known for its proximity to the Brijuni National Park and the historic town of Pula. The best time to travel to Duba, 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!