Supetar, Croatia offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Supetar is known for its beautiful beaches, the Church of the Annunciation, and the nearby Blaca Hermitage. The best time to travel to 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!