Two lifesavers patrolling just north of Frankston, at Kingston, came across the group about 4.30pm, about 90 minutes after a strong easterly wind change created rough waters on Port Phillip Bay. They found three kayaks capsized and another had sunk.

The lifeguards took the kayakers 150 metres back to shore one by one. It is understood they were several families with children from five to 15 years old.

President of Frankston Life Saving Club, Tim Cutrona, said volunteer lifesavers helped with the rescue once the exhausted kayakers were safely on the beach.

Life Saving Victoria manager Greg Scott said it was important for beachgoers to check weather forecasts.

"People need to understand beaches can be dangerous, even on days of perfect beach weather," Mr Scott said.

Nobody was injured but ambulance officers treated two kayakers.

Kayaking is one of the fastest growing sports in Australia, with 129,700 people participating, according to the Australian Bureau of Statistics last year.

However, Maritime Safety said there have been two deaths involving paddle craft since July and 10 in the past five years, accounting for a third of boating-related deaths.

Acting director Adrian Mnew​ warned that inexperience was often a factor in the spate of accidents.

"Always wear a lifejacket," he said. "Know your capabilities and don't put yourself at risk by going beyond them."