Cozumel, Mexico
    Manglares y Humedales del Norte de Isla Cozumel

    San Juan Reef

    Good diving all year

    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.

    Best timeYear-round
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeBarracuda, Bull Sharks, Dolphins, Eagle Rays and Nurse Sharks · 177+ species recorded
    Water27-30°C · warmest August, September, October
    CharacterWreck dive
    StandoutExceptional marine biodiversity

    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.

    Today05:4217:2911h 47m daylightGolden hour 16:59

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    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)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    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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