The two men, who were both wearing life jackets, were pulled from the water by Steve Lees, Andy Hall and Alan Hislop on Whaddayathink.
The trio had been out fishing and were returning to the bar when they heard a call on the radio that a boat had overturned.
Shortly after the group spotted the men in the water.
"We got on the right side of them, threw a rope and pulled them in one at a time," Lees said.
Despite having their boat overturn and ending up in the sea, he said the men were calm.
"They were pretty laid back guys.
"They were just out there having a swim.
"It's great they had the right gear with with them and didn't start panicking, that's the worst thing they could've done."
Coastguard Wanganui and Wanganui Surflife Saving member Jamie Newell said recently the bar has gained a build-up of silt which can create problems.
"When you start getting towards the lower tides, you get a low more wave action getting pushed up because there's not as much water in the bar as there has been in previous years.