Lu Bagnu, Italy offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Lu Bagnu is known for its beautiful beaches and proximity to the historic town of Castelsardo. The best time to travel to Lu Bagnu, Italy, 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!