Castle Island (NOS) 8444069 (CSIM3) — Live Marine Conditions & Buoy Data
NOAA station CSIM3, Castle Island (NOS) 8444069, reports real-time marine conditions from 42.341°N, 71.012°W in the western North Atlantic. Readings refresh roughly every 10 minutes, and Big Buoy adds 7-day tide predictions, a solunar table, and a multi-day weather outlook for the area.
Cape Cod Marine Conditions — Castle Island (NOS) 8444069 is one of several stations in Cape Cod. See live tides, buoy data, and solunar for the whole area.
Current conditions at Castle Island (NOS) 8444069
As of August 21, 2026 at 19:18 UTC, Castle Island (NOS) 8444069 (CSIM3) is reporting air temperature 68°F and wind from the ENE at 11 mph gusting 14 mph.
- Air temperature
- 68°F
- Wind
- ENE 11 mph (gust 14)
Observed August 21, 2026 at 19:18 UTC from NOAA NDBC station CSIM3. Readings update about every 10 minutes.
What NOAA buoy CSIM3 measures
As a NOAA meteorological station, CSIM3 reports wind speed, gusts and direction, barometric pressure, air and water temperature, and — where wave sensors are fitted — significant wave height, swell period, and wave direction.
What to watch in the western North Atlantic
Conditions along the Atlantic coast are driven by swell direction and the shifting western edge of the Gulf Stream. Northeast winds against an outgoing tide stack up steep, dangerous seas at inlets, and water temperature can change 10–20°F over just a few miles as the Gulf Stream boundary moves.
Frequently asked questions
- Where is NOAA buoy CSIM3 located?
- Castle Island (NOS) 8444069 (CSIM3) reports from 42.341°N, 71.012°W in the western North Atlantic.
- How often is NOAA buoy CSIM3 updated?
- Station CSIM3 typically reports new observations about every 10 minutes. Big Buoy refreshes continuously so you always see the latest readings, alongside 7-day tide predictions and a solunar table for the area.
- What does NOAA buoy CSIM3 measure?
- Big Buoy shows wind, barometric pressure, air and water temperature, and wave height and period where available for Castle Island (NOS) 8444069, plus 7-day tides, solunar peak windows, and a multi-day weather outlook.
- Is Big Buoy free to use?
- Yes. Live data for Castle Island (NOS) 8444069 and every other NOAA buoy is free with no account required. Big Buoy Pro adds the Wind Tab, the Depth Chart, satellite overlays (sea surface temp, chlorophyll, currents), 16-day forecasts, and forecast model switching.