Isla Coronado, Mexico offers 1 beach perfect for sunbathing, surfing, swimming, and more. Isla Coronado, Baja California Sur, Mexico, is known for its pristine beaches, crystal-clear waters, and the diverse marine life of the Sea of Cortez. The best time to travel to Isla Coronado, 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!