Lo de Marcos, Mexico offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Lo de Marcos is known for its tranquil beaches and the nearby Sierra de Vallejo Biosphere Reserve. The best time to travel to Lo de Marcos, Mexico, is between November and April, when the average air temperature is around 75-85°F (24-29°C) and the water temperature is approximately 77-82°F (25-28°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!