Lido di Ostia, Italy offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Lido di Ostia is known for its proximity to the ancient ruins of Ostia Antica and its beaches along the Tyrrhenian Sea. The best time to travel to Lido di Ostia, 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!