Sperlonga, Italy offers 9 beaches perfect for sunbathing, surfing, swimming, and more. Sperlonga is known for the ancient Roman villa and the Grotto of Tiberius. The best time to travel to Sperlonga, Italy, is from May 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!