New England, United States
    Mill Rock

    U Thant Island

    Best months: Jul–Sep

    Protected Area

    Mill Rock

    Why dive here

    With 35+ marine species recorded in the area - including nurse sharks - U Thant Island offers some of New England's richest reef diving. Water ranges 4-19°C, warmest July, August, September.

    Best timeJul–Sep
    WetsuitA 5mm wetsuit
    Marine lifeNurse Sharks · 35+ species recorded
    Water4-19°C · warmest July, August, September
    CharacterReef dive

    Alright, let's talk about U Thant Island. Forget the name for a second, because what we're really talking about here is an urban dive that’s wilder than you'd expect. We're not going to lie, the East River isn't exactly the Maldives, but that's precisely why we love it. Diving around this little man-made islet, right there in the heart of Manhattan, you're hit with a strange mix of city rumble and genuine marine life. The visibility can be a bit of a lottery, often ranging from a murky five feet to a surprisingly decent fifteen on a good day, especially after a few days without rain. What you lose in clarity, you gain in sheer novelty. We’ve bumped into striped bass lurking in the shadows, watched black sea bass dart between the rocks, and spotted all sorts of crabs clambering over the substrate. It’s an exercise in focused observation, scanning the murk for movement. Our favourite moments are finding those unexpected creatures – a lone longnose gar cruising by, or a school of anchovies shimmering past, completely oblivious to the skyscrapers above. This dive is for the adventurous, the city-dwelling diver who wants something truly different, who appreciates the grit and surprise of an urban ecosystem. It's a reminder that nature persists, even in the most unlikely corners.

    Safety Notes

    Cold water this month (avg 15°C). Drysuit or thick wetsuit (7mm+) recommended.

    Today06:0217:2511h 23m daylightGolden hour 16:48

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    Conditions

    Ocean conditions, forecast and tides for U Thant Island

    U Thant Island Ocean Conditions

    Monthly averages for U Thant Island, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (42.6, -70.6) (0km away)

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    October Averages

    Sea Temperature

    15°C

    59°F · Range: 12.8–18.1°C

    Air Temperature

    10°C

    50°F

    Wind Speed

    3.78 m/s

    7.3 knots

    Atmospheric Pressure

    1017 hPa

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data

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