Baia Arena, Italy offers 1 beach perfect for sunbathing, surfing, swimming, and more. Baia Arena, Campania, Italy, is known for the Baia Underwater Archaeological Park. The best time to travel to Baia Arena, 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!