Esmeralda K, Mexico offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Esmeralda K, Quintana Roo, Mexico, is known for its proximity to the Sian Ka'an Biosphere Reserve. The best time to travel to Esmeralda K, Mexico, is between November and April, with average air temperatures around 75°F (24°C) and water temperatures near 80°F (27°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!