San Juan Reef
Protected Area
Manglares y Humedales del Norte de Isla Cozumel
Why dive here
With 177+ marine species recorded in the area - including barracuda, bull sharks, dolphins, eagle rays and nurse sharks - San Juan Reef offers some of Cozumel's richest wreck diving. Water ranges 27-30°C, warmest August, September, October.
We love San Juan Reef for a chilled-out drift after the adrenaline of Barracuda or Cantarel. It’s a shallower spot, topping out around 20 metres, and the current here is usually just a gentle push, perfect for really soaking in the details. You’re carried over these massive formations of finger corals and big lettuce corals, like swimming through an ancient, underwater garden. We always keep an eye out for the smaller stuff – Goldspot Gobies perched on the sand, or the quirky Green Razorfish darting in and out of the seabed. Look closely in the ledges and overhangs, and you’ll often find schools of French Grunts huddled together, their stripes shimmering in the filtered light. It’s a great site for photographers who want to slow down, or for anyone who just wants to enjoy a relaxed, pretty reef without feeling rushed. The visibility here is consistently good, often pushing past 20 metres, so you’ve got plenty of light to see those vibrant reds of the seaweed and the endless damselfish flitting about.
Safety Notes
Wreck site - avoid penetration without wreck diving certification. Watch for sharp metal and entanglement hazards.
Strong currents typical this month (avg 79 cm/s). Good buoyancy control essential.
Nearest Dive Centres to San Juan Reef
Dive shops near San Juan Reef
Bluedream Cozumel
Pepe Scuba Dive Shop
AGUA CLARA DIVING
Cozumel Dive School
Aldora Divers
TRIPPY DIVERS
Reviews for San Juan Reef
Conditions
Ocean conditions, forecast and tides for San Juan Reef
San Juan Reef Ocean Conditions
Monthly averages for San Juan Reef, sourced from NOAA NDBC + Copernicus Marine (EU) - nearest station: Yucatan Basin - 120 NM ESE of Cozumel, MX (227km away)
October Averages
Sea Temperature
30°C
85°F · Range: 28.7–32.3°C
Air Temperature
29°C
84°F
Current Speed
78.6 cm/s
Direction: NE (36.7°)
Chlorophyll-a
0.046 mg/m³
Very clear (oligotrophic)
Salinity
35.99 PSU
Wave Height
1.1m
6.7s period
Wind Speed
5.5 m/s
10.7 knots
Atmospheric Pressure
1010.7 hPa
Visibility
24.1 nmi
Based on 5 years of monitoring data · Data sources: NOAA NDBC + Copernicus Marine (EU)
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