Ostende, Argentina offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Ostende is known for its beautiful sandy beaches and relaxed coastal atmosphere. The best time to travel to Ostende, 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!