An emergency services spokesman said it was uncertain how she got back on to the rocks.
“There were a couple of other people there at the time and the alarm was raised. It’s not clear how the woman ended up in the water,” he said.
Lifeguards from Riversun Wainui Surf Life Saving Club responded in an IRB (inflatable rescue boat) and a crew member began CPR on the rocks after arriving at the scene.
“The IRB driver returned to shore to transport ambulance staff and police to where efforts were being made to revive the woman,” a Surf Life Saving NZ (SLSNZ) spokesman said.
“A paramedic pronounced her deceased and lifeguards then assisted with returning everyone to shore.”
The Search and Rescue emergency callout squad also responded by road to the incident.
“We extend our heartfelt condolences to the whānau and friends of the victim,” SLSNZ said. “We also commend the efforts of the surf lifeguards involved and have offered support services to them.”
It was the second water-related tragedy in the Eastern district in 24 hours.
A man died in an incident off Wainuiorangi Rd in Mahia on Sunday.
Both deaths will be referred to the coroner.
The rescue flags at the Wainui surf life saving club were flown at half mast on Tuesday out of respect for the woman who died.
A 48-hour rāhui was placed by local whānau/hapū over the Whales End (the northern end of Wainui Beach) until 10am Wednesday.
Police have issued a reminder on water safety.
Eastern District Commander Superintendent Jeanette Park said water safety was often overlooked but was extremely important, especially at this time of the year.
“As the temperatures continue to soar, more people are looking to cool off in the water,” Park said. “We’re asking everybody to be aware of their surroundings and capabilities while participating in water-related activities.
“Do not go into deep water beyond where you are comfortable, and make sure you look after those with you. You should also be prepared for a sudden change in conditions.”
Park said police wanted everybody to enjoy the weather, but to do so safely.
More information on water safety can be found on the Water Safety New Zealand website.
“If you or somebody else is in immediate danger, please call 111.”