Prince Islands, Turkey offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Prince Islands, Istanbul, Turkey, is known for its historic wooden mansions and the iconic Aya Yorgi Church. The best time to visit the Prince Islands in Turkey is from May to September, with average air temperatures ranging from 20-30°C (68-86°F) and water temperatures around 20-25°C (68-77°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!