Neptunia, Uruguay offers 1 beach perfect for sunbathing, surfing, swimming, and more. Neptunia is known for its proximity to the beautiful beaches of the Costa de Oro. The best time to travel to Neptunia, Uruguay, is from December to February, with average air temperatures around 75°F (24°C) and water temperatures near 72°F (22°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!