Belej, Croatia offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Belej, Primorje Gorski Kotar, Croatia, is known for its picturesque landscapes and proximity to the pristine beaches of the island of Cres. The best time to travel to Belej, Croatia, is from June to September, with average air temperatures around 75°F (24°C) and water temperatures around 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!