Saint Elmo, Italy offers 1 beach perfect for sunbathing, surfing, swimming, and more. Saint Elmo, Sardinia, Italy, is known for its proximity to the stunning beaches of Costa Rei and the historic Castello di Sanluri. The best time to travel to Saint Elmo, Italy, is from May to September, 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!