Isla Santiago Oeste, Argentina offers 1 beach perfect for sunbathing, surfing, swimming, and more. Isla Santiago Oeste, Buenos Aires, Argentina, is known for its proximity to the Parana Delta and the unique natural landscapes it offers for eco-tourism. The best time to travel to Isla Santiago Oeste, Argentina, is from December to February, with average air temperatures around 75°F (24°C) and water temperatures near 70°F (21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!