Slano, Croatia offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Slano, Dubrovnik Neretva, Croatia, is known for its proximity to the Adriatic Sea and the historic Franciscan Monastery. The best time to travel to Slano, Croatia, is from June to September, when the average air temperature is around 25°C (77°F) and the sea temperature is approximately 24°C (75°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!