Marcelli, Italy offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Marcelli is known for its beautiful beaches along the Adriatic Sea and its proximity to the Conero Riviera. The best time to travel to Marcelli, 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!