Hanalei Bay was reopened Friday after Ocean Safety officials determined the water was safe for swimming.
The bay was closed Thursday after a shark was spotted in the water.
Lifeguards said the shark was about 6-feet long and was caught breaching and thrashing near the shoreline.
Beachgoers are reminded to stay out of brown and turbid water as a safety precaution.
Ocean Safety officials advise swimming or snorkeling at Poipu Beach where the water clarity is better.