Castellammare di Stabia, Italy offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Castellammare di Stabia is known for its ancient Roman villas, the Stabiae archaeological site, and the Terme Stabiane thermal baths. The best time to travel to Castellammare di Stabia, Italy, is from May to September, with average air temperatures ranging from 70-85°F (21-29°C) and water temperatures around 72-79°F (22-26°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!