Opcina Lumbarda, Croatia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Opcina Lumbarda, Istria, Croatia, is known for its Grk wine, sandy beaches, and proximity to the historic town of Korcula. The best time to travel to Opcina Lumbarda, Croatia, is from June to September, when the average air temperature is around 77°F (25°C) and the sea temperature is approximately 75°F (24°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!