Gualeguaychu, Argentina offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Gualeguaychu is known for its vibrant Carnival celebration, which is one of the most famous in Argentina. The best time to travel to Gualeguaychu, Argentina, is from December to February, with average air temperatures around 28°C (82°F) and water temperatures near 25°C (77°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!