Scuba Diving in San Carlos, Sonora: Best Spots, What to See & Everything You Need to Know
Jacques Cousteau sailed into the Sea of Cortez in the 1960s and called it the world's aquarium. He had access to every ocean on the planet. He chose that name for the Cortez. Mr. Playas is not Cousteau, but he shares the opinion after many dives.
San Carlos is the perfect entry point to that aquarium: 45 minutes by boat you have reefs with sea lions, underwater canyons, fauna that includes manta rays, nurse sharks, and hundreds of species of colorful fish. All with zero tourist overcrowding — no lines of divers like Cozumel and none of the inflated prices of Los Cabos.
Best Dive Sites Near San Carlos
If you do not know San Carlos yet, start with our complete San Carlos guide.
Dive Operators in San Carlos
The main certified PADI operators in San Carlos are Cortez Exploration, Sea of Cortez Dive Center, and Dive San Carlos. All run San Pedro Nolasco as their flagship site. Compare prices and what is included: two-tank dives typically include tanks, weights, and a naturalist guide. Wetsuits and BCDs are usually available to rent.
Prices (2026)
| Service | Price per person | Includes |
|---|---|---|
| Snorkel at San Pedro Nolasco | $40–60 USD | Transport, guide, snorkel gear, water |
| Certified dive (1 tank) | $80–100 USD | Transport, PADI guide, full gear, water |
| 2-tank dive (full day) | $100–120 USD | Transport, 2 dives, guide, gear, snacks |
| Coastal snorkel | $25–35 USD | Guide, snorkel gear, short transport |
| Night dive | $70–90 USD | Guide, gear, underwater lights |
| Open Water PADI course | Contact | Certification included (3–4 days) |
What You Will See
Sea lion colony at San Pedro Nolasco: guaranteed interaction on most dives. Bottlenose dolphins frequent the transit to the island. Giant hawksbill sea turtles year-round. Manta rays most commonly October through April. Nurse sharks on the sandy sections. Schools of jacks, grouper, parrotfish, damselfish, and the endemic Cortez angelfish. Moray eels in the rock formations. Occasional whale shark sightings in late summer.
Best Season
October through June: water temperature 68–77°F, visibility 15–30 meters, calmer seas. July through September: visibility drops, water temperature rises to 82–86°F (wetsuits optional), occasional hurricane conditions. Year-round diving is possible but October–June is the prime window.
People describe the sea lion interaction at San Pedro Nolasco in the same words every time: they come up from below, they barrel-roll around you, they stare at you six inches from your mask, and then they vanish. For the 30 seconds it lasts, you forget you are breathing from a tank. It is the most extraordinary wildlife encounter in Sonora and most people drive past San Carlos to go to Cabo. .
Can I Dive Without Certification?
Yes, with the Discover Scuba Diving (DSD) program from PADI. It is a supervised introduction that allows a real dive (maximum 12 meters depth) with a certified instructor, no prior course needed. Same-day experience, about 3 hours, and the perfect way to test if diving is for you. Price: approximately $80–100 USD per person including gear and instructor.
What to Bring for a Dive Day
- Swimsuit — under the wetsuit or for snorkel
- Quick-dry towel — regular towels get heavy when wet
- Mineral SPF 50+ sunscreen (reef-safe — the reef appreciates it)
- Snacks and food for the boat — full-day tours do not always include lunch
- Extra water — diving dehydrates more than you think
- Motion sickness medication if susceptible — the boats in open sea move
- Waterproof camera or GoPro — the underwater scenery at San Pedro Nolasco deserves documentation
Frequently Asked Questions
For the main sites (San Pedro Nolasco, Las Monas): yes, minimum Open Water certification. For El Soldado and shallow shore dives: Discover Scuba programs are available through local operators for first-timers — no certification required.
Isla San Pedro Nolasco for the sea lion colony and wall diving. Las Monas for a more accessible alternative. El Soldado for beginners and refresher dives.
October through June: 68–77°F — a 3mm wetsuit is comfortable. July through September: 80–86°F — wetsuit optional. Water clarity is best in the cooler months.
Yes. Most dive operators take snorkelers on the same boats. Piedras Pintas beach is excellent for shore snorkeling. San Pedro Nolasco surface snorkel tours are available.
