Isola del Giglio, Italy offers 15 beaches perfect for sunbathing, surfing, swimming, and more. Isola del Giglio is known for its picturesque beaches, the historic Giglio Castello, and the Costa Concordia shipwreck site. The best time to travel to Isola del Giglio, Italy, is from June to September, with average air temperatures around 75-85°F (24-29°C) and water temperatures around 73-79°F (23-26°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!