Monte Alto, Mexico offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Monte Alto, Texas, Mexico, is not a recognized city or tourist destination, as Monte Alto is actually a census-designated place in Texas, USA, and not located in Mexico. The best time to travel to Monte Alto, Mexico, is from November to 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!