Check here for the Interactive Marine Observations Page put out by NOAA.

Here is a list of Oceanographic Organizations and Laboratories.

Check this Fisheye View Coral Reef Cam

or here is a Live Cameras--Sharks, Coral, Seas This is at Waikiki so take into account any time difference. There are no lights so you can't see anything at night.

Click on the temperature map to go to the updated site for the most recent surface sea temperature data. Just choose your data.