Koromacno, Croatia offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Koromacno is known for its proximity to the scenic Ucka Nature Park and the historic town of Labin. The best time to travel to Koromacno, Croatia, is from June to September, when the average air temperature is around 75°F (24°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!