The wild weather in NSW kept police and emergency crews busy with bush rescues as heavy rain and high winds put bushwalkers and campers at risk.

Police and NSW Ambulance paramedics teamed up to locate three separate groups of bushwalkers lost in the Blue Mountains on Saturday as the low pressure weather system tracked south.

The searches got underway on Saturday as the weather deteriorated.

In the first incident, rescuers were alerted when a personal locator beacon (PLB) loaned to an American man on a two-day walk was activated in the Grose Valley about 3.15pm (AEDT).

A four-man team searched until 3.30am (AEDT) on Sunday before being withdrawn and at 9am (AEDT) the man rang triple zero to say he'd made it out to Victoria Falls car park.

He told police he'd been swept downstream during the storm but had been able to get out of the Grose River and walk out.

A second PLB activation around 5.30pm (AEDT) in the Whingee Whungee Canyon came from a six-member canyoning team who were found shortly before 9pm (AEDT) trapped on the other side of the canyon by floodwaters.

The group camped overnight and an Ambulance medical rescue helicopter winched the uninjured bushwalkers to safety on Sunday.

In the third incident, police and ambulance paramedics unsuccessfully searched on Saturday night for a couple, both aged 41, who failed to return from a canyoning trip to Empress Falls, near Wentworth Falls.

About 8am (AEDT) on Sunday a National Parks and Wildlife Service team found the pair, who told police they had realised they were lost and decided to camp overnight.

On the south coast, seven campers were rescued by helicopter on Sunday morning from their camping site on the Clyde River near Ulladulla after they were stranded by rising waters.

At noon (AEDT) on Sunday a Westpac Lifesaver helicopter was sent to help search for an elderly man missing since Saturday afternoon from a nursing home at Tweed Heads on the far north coast.

The crew located the man in steep terrain partially submerged in a water hole some 500 metres to the east of the home.

He was winched aboard and taken to Tweed Heads Hospital with hypothermia, cuts and abrasions.