Gulf of California, Mexico offers 1 beach perfect for sunbathing, surfing, swimming, and more. Gulf of California, Sonora, Mexico, is known for the stunning beaches of San Carlos and the diverse marine life in the Sea of Cortez. The best time to travel to the Gulf of California, Mexico, is from November to April, with average air temperatures ranging from 70-85°F (21-29°C) and water temperatures around 68-75°F (20-24°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!