Krk, Croatia offers 23 beaches perfect for sunbathing, surfing, swimming, and more. Krk is known for its historic Krk Cathedral and the Frankopan Castle. The best time to travel to Krk, Croatia, is from June to September, when the average air temperature is around 25°C (77°F) and the sea temperature is approximately 24°C (75°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!