NOAA NDBC NTKM3
Nantucket Harbor water temperature
Latest water temperature and buoy observations for Nantucket Harbor from NDBC station 8449130 - Nantucket Island, MA (NTKM3). The station is 0.2 nautical miles from Nantucket Harbor.
See today's Boat or Nope call for Nantucket HarborLatest report
54.9°F
54.9°F is cold water. A fall overboard can cause cold shock well before hypothermia. Wear a life jacket you can swim in.
- Water
- 54.9 °F
- Wind
- 14 kt (16.1 mph)
- Gust
- 23 kt
- Seas
- ft
- Observed
- Oct 22, 6:30 PM EDT
Wind at 14 knots is Beaufort force 4, Moderate breeze. A 17-ft open boat feels this wind. Many 23-ft boats are still fine. A 40-ft boat usually has margin. Boat or Nope's default 23-ft profile uses a 15-knot wind limit, inside this band. Beaufort scale · Knots to mph
Source and freshness
Retrieved from the NOAA NDBC realtime 2 file. A fresh copy is reused for about 2 minutes, and a recent copy can stand in for up to 30 minutes if the feed blips. Retrieved Oct 22, 7:21 PM EDT.
NDBC station NTKM3 · Realtime file
This buoy is also the observation station for Bass Rip, Buzzards Bay, Nantucket Sound, and adjacent waters, Mass Anchorage Area G, Buzzards Bay, Nantucket Sound, and adjacent waters, Mass Anchorage Area J, East Pond, Hither Creek, The Creeks.
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Nearby water temperature stations
Water temperature questions
Where does the Nantucket Harbor water temperature come from?
Water temperature, wind, and seas on this page come from the NOAA NDBC realtime feed for station NTKM3 (8449130 - Nantucket Island, MA). That is the same buoy file the Nantucket Harbor harbor page already requests. This page does not add a separate CO-OPS water-temperature product.
How fresh is the buoy reading?
The page shows the observation time from the NDBC report and the time Boat or Nope retrieved the file. The realtime file is cached for about 2 minutes when fresh, and a recent copy can be reused for up to 30 minutes if NDBC is briefly unavailable.
Why might the beach feel different from this temperature?
A buoy can sit offshore of the harbor, and shallow water warms and cools faster than the sensor. The station name and distance, when Boat or Nope has one, say how far the reading is from the harbor.
What does a cold reading mean for boating?
Water under 60°F can cause cold shock if someone falls in. The note on this page is general context. It is not a life-jacket or wetsuit rule for your boat.