A high surf warning remains in effect until 6 p.m. Friday for north and west facing shores of Molokai and north facing shores of Maui, the National Weather Service said.
A storm in the north Pacific has generated a large northwest swell that was expected to continue to build Thursday night.
Surf heights are expected to hit 15 to 20 feet Thursday night, peaking early Friday and diminishing throughout the day.
Beach goers need to exercise caution due to large surf and sweeping waves; swimmers need to be aware of dangerous rip currents.
Boaters should be aware of increased numbers of surfers and body boarders using harbor channels to access surfing areas.