Grand Cayman, Cayman Islands
    Bat Cave Beach

    Bonnie's Arch

    Best months: Dec–Mar

    Protected Area

    Bat Cave Beach

    Why dive here

    With 327+ marine species recorded in the area - including barracuda, bull sharks, oceanic whitetip sharks, orcas and sea turtles - Bonnie's Arch offers some of Grand Cayman's richest reef diving. Water ranges 27-31°C, warmest August, September, October.

    Best timeDec–Mar
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeBarracuda, Bull Sharks, Oceanic Whitetip Sharks, Orcas and Sea Turtles · 327+ species recorded
    Water27-31°C · warmest August, September, October
    CharacterReef dive
    StandoutExceptional marine biodiversity

    Bonnie’s Arch. We reckon this site is one of Grand Cayman’s most photogenic spots, especially if you catch it at the right time of day. We’re talking about that sweet morning light, maybe 9 or 10 am, when the sunbeams slice through the water and spotlight the arch itself. It’s a proper swim-through, about 30 feet wide, carved naturally out of the reef, and it often has schools of tarpon just hanging out, shimmering in the shadows. Horse-eye jacks like to cruise through too. Beyond the arch, it’s a lovely mix of coral formations and a small wall that drops to about 21m. Keep an eye out for the cleaning stations; we’ve seen some huge groupers getting a spa treatment from tiny shrimp and gobies there. The visibility usually sits around 25m, making for some clear views. It’s a relaxed dive, good for anyone who enjoys a bit of exploration and wants to capture some classic Caribbean reef shots.

    Today06:1818:0711h 48m daylightGolden hour 17:38

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    Conditions

    Ocean conditions, forecast and tides for Bonnie's Arch

    Bonnie's Arch Ocean Conditions

    Monthly averages for Bonnie's Arch, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (19.38, -81.32) (5km away)

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    October Averages

    Sea Temperature

    30°C

    87°F · Range: 29.1–31.8°C

    Current Speed

    4.47 cm/s

    Direction: NW (296.6°)

    Chlorophyll-a

    0.045 mg/m³

    Very clear (oligotrophic)

    Salinity

    36.14 PSU

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)

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