Surf lifesavers in the Northern Region are under unprecedented strain this summer.
The number of people flocking to Auckland, Northland and Waikato beaches at peak times is about 30,000 more than last summer and lifeguard rescues are up by 170 per cent.
Northern Region life-saving manager Duncan Buchanan said 230 people have been rescued so far this lifesaving season, up from 87 the previous season.
"Hand-in-hand with those big numbers at the beaches, we've had a couple of weekends with outgoing tides throughout the day, big surf on the west coast, that storm and north easterlies have pushed a bit of current down the east coast.
"The beaches that maybe were a little bit more benign have more water moving through them. A number of circumstances have come together and really pushed the lifeguards."
He said lifesavers are bracing themselves for more rescues over the long weekend.
"We've had 51,000 hours of lifeguarding this summer so far, about 3,000 more hours compared to this time last year."
He said the tolls are taking a significant strain on the volunteers.
"It's a huge, huge commitment for a volunteer organisation. The additional hours are definitely starting to take its toll on guards."
The latest figures come a week after it was revealed lifeguards are facing extraordinary amounts of abuse from the public.