Meanwhile, kite surfers are being asked to take care after five people had to be rescued around Raglan Harbour on Wednesday.

Lifeguards said most were not in significant distress but needed help getting back to shore after they had lost wind, damaged equipment or been blown off course. The increasingly popular sport was a problem for Raglan lifeguards who were spending a lot of time away from patrolled areas helping kite surfers, said lifesaving development officer Andy Kent.

At least 20 kite surfers had been rescued this season.

Lifeguards recommend kite surfers check surf and wind conditions before heading out.

"We would also like to stress that they know their limits; are confident swimming in the conditions; have a personal flotation device; stay well away from the flagged patrol area and remain 200m away from any swimmers."