Popova Luka, Croatia offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Popova Luka, Dubrovnik Neretva, Croatia, is known for its proximity to the stunning natural beauty of the Mljet National Park. The best time to travel to Popova Luka, Croatia, is during late spring to early autumn (May to September), with average air temperatures ranging from 20°C to 30°C and water temperatures around 22°C to 25°C. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!