Zrnovo, Croatia offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Zrnovo, Dubrovnik Neretva, Croatia, is known for its proximity to the historic town of Korcula and its traditional stone masonry. The best time to travel to Zrnovo, 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!