The citys Ocean Safety Division is warning beachgoers of an anticipated arrival of box jellyfish along Oahu shorelines on Wednesday.
The influx is expected to peak on Thursday and Friday, with most of the jellyfish gone by Saturday.
The commonly affected beaches are the Ala Moana Beach Park swim channel and Waikiki Beach. Other areas that typically are affected include Hanauma Bay, Pokai Bay and Makaha Surfing Beach.
Lifeguards will assess the beaches for box jellyfish and post warning signs when needed.
Anyone stung by a box jellyfish should flush the area with lots of vinegar and seek medical attention if pain persists.
The city lifeguard stations are equipped to treat jellyfish stings.
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