Sirmione, Italy offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sirmione is known for the Scaliger Castle, Grottoes of Catullus, and its thermal baths. The best time to travel to Sirmione, Italy, is from May to September, with average air temperatures ranging from 20°C to 30°C and water temperatures around 18°C to 25°C. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!