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Where can I get current sea-surface temperature data?

The USGS has studied sea-surface temperature in many areas around the globe; you can find publications from these studies in the USGS Publications Warehouse and by searching on the Internet.

World maps and data are available from other agencies, particularly at the NOAA's Sea Surface Temperature , and at the JPL Physical Oceanography Distributed Active Archive Center

For specific data covering coastal areas, consult the NOAA CoastWatch Program.