Grad Supetar, Croatia offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Grad Supetar is known for its beautiful beaches, the Church of the Annunciation, and the Supetar Cemetery designed by Ivan Rendic. The best time to travel to Grad Supetar, 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!