NSW Rural Fire Service spokesman Phil Paterson urged people who usually travel to these areas to "reconsider for a day or two" in the face of a catastrophic fire danger level on Saturday.

"We would prefer people to minimise their movement on the roads, shelter in place and keep an eye on all the available information," he said.

"This keeps the roads clear so we can move our appliances around and get them quickly to locations where we can best protect lives and property."

Fire crews and residents facing the march of the Currowan fire, on the NSW South Coast, are fearing a southerly change on Saturday afternoon could spot the fire up the coast toward leafy Kings Point, Burrill Lake, Milton and the western areas of Ulladulla.

Since Friday, the Currowan fire has spotted north and forced the closure of Woodburn Road and Wheelbarrow Road to the west of Tabourie Lake.

The Tianjara fire had already closed Braidwood Road, joining the Kings Highway and Araluen Road as the three key road closures between the ACT and the South Coast.

Any ACT residents planning to travel to the South Coast must do so via the Illawarra Highway to the north, or via Cooma and the Brown Mountain to the south.

State Emergency Service volunteers have been door-knocking around Wandindian, Sussex Inlet and Burrill Lake to ensure they are prepared.

Anne Schubert, who owns the Lakeshore Lodge on 130 acres lining the foreshore of Burrill Lake, said she has been watching a procession of water bombing aircraft skimming the lake for payloads of water, then heading into the mountains.

"At the moment, the wind is holding the fire several hundred metres off the edge of our property," she said.

"But our big concern is it [the wind] is predicted to turn around on Saturday.

"We have a small boat and a few kayaks, so if worse come to worst, we'll just grab our two cats and what we've gathered up and push off into the lake."

The area around her is scattered with multi-million dollar rural holdings with formal tree-lined entry ways off Tallow Wood Road and Westlake Drive, with vistas across Burrill Lake.

At Lake Tabourie Holiday Park, owner Andy Cunningham was pleased to see an onshore sea breeze clearing the air on Friday afternoon but knew that Saturday morning would bring a return of still and smoky air, and the uncertainty which goes with it.

"Being so close to the coast we're not directly impacted because of the onshore breeze but it's a fluid situation for us and our guests," Mr Cunningham said.

"It think this uncertainty will go continue right through January."