The National Weather Service extended a high surf advisory for the north and west shores of Kauai, along with the north shores of Oahu, Molokai and Maui.
The advisory is now in effect until 4 p.m. Tuesday.
Forecasters said a large northwest swell and locally-generated wind waves are producing elevated and rough surf along several shores of the smaller islands.
Surf could reach up to 15 feet through Tuesday afternoon, according to forecasters.
Beach goers, swimmers and surfers should heed all advice given by ocean safety officials and exercise caution.