Tetuan Viejo, Mexico offers 1 beach perfect for sunbathing, surfing, swimming, and more. Tetuan Viejo is known for its proximity to the famous Mazatlan, a popular tourist destination in Sinaloa, Mexico. The best time to travel to Tetuan Viejo, 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!