Preko, Croatia offers 20 beaches perfect for sunbathing, surfing, swimming, and more. Preko, Zadar, Croatia, is known for its picturesque beaches and the historic St. Michael's Fortress. The best time to travel to Preko, Croatia, is from June to September, when the average air temperature is around 75°F (24°C) and the sea temperature is approximately 77°F (25°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!