Ventotene, Italy offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Ventotene is known for the Ventotene Island, the Santo Stefano Prison, and the Ventotene Lighthouse. The best time to travel to Ventotene, Italy, is from May to September, with average air temperatures ranging from 70°F to 85°F and water temperatures from 70°F to 78°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!