Yes. See the 77-78.1F sea surface temperatures versus Human body temperatures. Note how the wind speeds contribute to wind chill when you are immersed in the sea and your haed is exposed to the winds.
HYPOTHERMIA IN HAWAII
This general information is provided to help you recognize the onset of Hypothermia. It is not intended to replace professional medical attention. Even in Hawaiis ocean waters the threat of Hypothermia exists. Hypothermia is the condition in which the body loses heat faster than it is producing it.
You can survive in 78deg water for a very long time, and most of the people on board swam to the shore quite quickly, and the rescuers came on the scene promptly.