Krnica, Croatia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Krnica, Istria, Croatia, is known for its proximity to the scenic Kamenjak National Park and the historic Pula Arena. The best time to travel to Krnica, 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!