"He was vomiting when we got him into the boat and we needed to get him to shore quickly."
Karipa said members of the public were very helpful and an off-duty St John officer was able to lend his assistance.
"The main thing is that we were able to keep two people with us for the new year and they were very grateful afterwards."
Senior lifeguard Daniel Comp, who was there to lend assistance, said he was very proud of the young team.
"They did everything right and acted quickly so they are fully entitled to claim credit for the rescue," he said.
"Those guys would not be still here if it wasn't for them."
Whanganui Surf Lifesaving chairman James Newell said the experience is a timely reminder for everyone swimming at beaches and rivers this summer.
"Swimming while intoxicated is never a good idea and inflatables like lilos or air mattresses are dangerous in the water.
"The swimmers were also outside the patrol area which provided an extra challenge for the lifeguards.
"It is important for everyone to always swim between the flags and lifeguards don't need the added stress of trying to herd people into the right areas."
The Whanganui Lifeguard Service is provided at Castlecliff and Kai Iwi beaches from 10am until 6pm until February 28, 2021.