Juan Fernandez, Chile offers 1 beach perfect for sunbathing, surfing, swimming, and more. Juan Fernandez, Valparaiso, Chile, is known for the Juan Fernandez Archipelago, including Robinson Crusoe Island. The best time to travel to Juan Fernandez, Chile, is from November to March, with average air temperatures around 68°F (20°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!