Kastel Stari, Croatia offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Kastel Stari is known for its historic Kastel Vitturi, beautiful Adriatic beaches, and proximity to the UNESCO World Heritage Site of Trogir. The best time to travel to Kastel Stari, Croatia, is from May to September, when the average air temperature is around 75°F (24°C) and the sea temperature is approximately 73°F (23°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!