U Thant Island
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.
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.
Nearest Dive Centres to U Thant Island
Dive shops near U Thant Island
Stingray Divers
Scuba Learning Center
Scuba New York
Dark Water Divers
Dosil's
Reviews for U Thant Island
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)
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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