Rio Sur America, Argentina offers 1 beach perfect for sunbathing, surfing, swimming, and more. Tierra del Fuego is known for Ushuaia, the southernmost city in the world, and its proximity to the stunning landscapes of the Tierra del Fuego National Park. The best time to travel to Rio Sur, Argentina, is from December to February, with average air temperatures around 75°F (24°C) and water temperatures near 68°F (20°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!