The NSW Rural Fire Service is hopeful favourable conditions will help crews tackle blazes at the South Coast.
Rain and cooler conditions are forecast for Thursday and into the weekend.
NSW RFS public liaison officer Jonty Bruce said crews were hopeful the Clyde Mountain fire could be contained in coming days.
The fire is burning in the Clyde Mountain area south of the Kings Highway through to the Deua River Valley. The fire destroyed hundreds of homes around the Batemans Bay area on New Year's Eve.
Mr Bruce said crews were monitoring hotspots on the Clyde Mountain fire ground and hoped to contain it by the end of the week.
"We've got a good little window here," he said.
But Mr Bruce said crews would not be dependent on the forecast rainfall.
"We're being mindful and continuing to work as if we weren't going to get rain," he said.
Mr Bruce said despite the easing conditions people should be aware they were dealing with fires that would burn for weeks.
"It's a campaign fire, it will go on for weeks and even once the main parts are out there will be unburnt areas in burnt areas that will flare up," he said.
"We might get rain and cool periods [but] we'll continue to get flare ups and fire activity will increase and decrease and people need to remain vigilant."
Temperatures in the mid-to-low 20s are forecast at the South Coast on Friday and into the weekend, according to the Bureau of Meteorology.
Bureau meteorologist Bimal Kc said a weather system from the northern part of the state would drag tropical moisture down to the South Coast.
Mr Kc said the system would start on Friday but more significant rainfall activity was expected on the weekend.
"The main shower activity will move towards the South Coast from Saturday," he said.
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It comes as fires across south-east NSW flared up on Saturday during a day of horror fire conditions.
The NSW RFS confirmed that five homes in the Bega Valley had been destroyed since Saturday.
There were 23 outbuildings lost. Sixty homes were saved.
Building assessment teams are still in the area determining the total losses.
On Tuesday, more than 1500 firefighters were tackling blazes across NSW.
Mr Bruce said efforts on the South Coast were focused on strengthening containment lines.
Backburning operations also took place in the Badja Forest Road fire ground, which is burning between Moruya in the north and Bega in the south.
There were flare ups in already burnt areas on Tuesday but these did not pose a threat to life or property, Mr Bruce said.
South of the Badja Forest Road blaze, fire activity increased near Myrtle Mountain at the Big Jack Mountain fire on Tuesday and it was upgraded to watch and act shortly before 3pm.
Fire activity also increased on the Border Fire, south of Eden on Tuesday afternoon. It was upgraded to watch and act at 3pm.
