Isla Santa Catalina, Mexico offers 1 beach perfect for sunbathing, surfing, swimming, and more. Isla Santa Catalina is known for its unique flora and fauna, particularly the giant barrel cactus and the Santa Catalina rattlesnake. The best time to travel to Isla Santa Catalina, Mexico, is from November to April, with average air temperatures around 70-80°F (21-27°C) and water temperatures around 70-75°F (21-24°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!