Petrovac, Serbia offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Petrovac, Southern and Eastern Serbia, Serbia, is known for the Gornjak Monastery and the scenic Homolje Mountains. The best time to travel to Petrovac, Serbia, is from June to September, with average air temperatures around 25°C (77°F) and water temperatures around 23°C (73°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!