The fire ground received about 40mm of rainfall, dampening the bushfire to just smoldering hot spots.

The fire has now been downgraded to patrol level, and will continue to burn within containment lines at a very slow rate of spread.

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Rural Fire Service (RFS) superintendent Michael Brooks said the fire would remain at this level for some time.

"We do expect timber and roots underground to maybe pop up as the moisture goes and weather increases," Mr Brooks said.

"We'll keep monitoring it but we believe we've got it well contained, there's not a lot of hot spots."

RFS and NSW National Parks and Wildlife crews will continue to monitor and patrol the fire over the coming weeks.

Locals may still be impacted by smoke from the fire, and those affected should take precaution by leaving the area or remaining indoors with windows and doors closed

The bushfire burnt more than 18,000 hectares of the national park, after starting on October 17 from lightning strikes.

The national park remains closed to the public.