Kraljevica, Croatia offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Kraljevica is known for its historic Frankopan Castle and the Church of St. Nicholas. The best time to travel to Kraljevica, Croatia, is from June to September, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 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!