National Data Buoy Center (NDBC) Web Data Service
NDBC publishes real-time meteorological and oceanographic observations (the last 45 days) and historical archives from a global network of over 900 moored buoys, drifting buoys, C-MAN coastal stations, and partner stations. Data is exposed via HTTP file URLs, a THREDDS Data Server, and an OGC API Features collection. Observations include wave height, period, direction, sea surface temperature, wind, air pressure, salinity, and visibility.