Sant Antoni, Spain offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Sant Antoni, Catalonia, Spain, is known for its vibrant nightlife and beautiful beaches. The best time to travel to Sant Antoni, Spain, is from May to October, with average air temperatures ranging from 70°F to 85°F and water temperatures from 68°F to 77°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!