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So overall, compared to those warm water areas of the U.S. Gulf and Florida, Hawaiian waters are warmer in the winter and cooler in the summer. As a general rule, Hawaiian waters average 77 degrees in the wintertime to 82 degrees in the summertime.
Hawaii, being in the tropics, has very consistent temperatures (at sea level). Summer time highs average 85 degrees while winter month highs average 78. The longest and shortest days are 13.5 and 11 hours long, and the UV index in the winter still gets into the 6-7 range (higher than Florida for example). The temperature drops by about 10-15 degrees at night.