Cullen, Argentina offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Cullen, Tierra del Fuego, Argentina, is known for its proximity to the scenic landscapes of the Fuegian Andes and the Beagle Channel. The best time to travel to Cullen, Argentina, is during the summer months of December to February, when the average air temperature is around 60°F (16°C) and the water temperature is approximately 50°F (10°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!