The fire has burnt through 300 hectares of private property, crown land and state forest and remains out-of-control.

The fire is moving up the escarpment in very steep terrain.

"Current weather conditions are pushing the fire in an easterly direction towards Newnes State Forest and in a northerly direction along Wolgan Road," incident controller Superintendent Joshua Turner said.

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"Residents in Lidsdale may experience increasing smoke in the area throughout tonight."

More than 130 firefighters from Fire and Rescue NSW, NSW Rural Fire Service and the Forestry Corporation of NSW are being supported by five aircraft are working to contain the fire.

People are requested to avoid travelling to the area so as to not impede fire fighting operations.

Update 6.23pm

Rain has begun to fall in the affected area, hopefully bringing some relief in the fire effort at Lidsdale. Strong winds continue to blow throughout the region, with cold conditions to set in for the weekend, with some chance of snow.

Update 4.58pm

A NUMBER of properties are under threat by the fast-moving bushfire burning out-of-control.

The blaze has grown to 95 hectares and NSW RFS Chifley/Lithgow zone operational officer Brett Taylor said residents near the fire should stay where the are.

"There's a few properties under threat so we are doing property protection," he said.

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"Stay where you are, stay in place where it's safe and stay off the roads.

"It's jumped the Wolgan Road and it's heading in an easterly direction and it's up to the edge of the escarpment to the east of that location."

Mr Taylor said wind gusts of up to 50km/h and an approaching front are making the situation difficult for firefighters.

"With the wind that we've currently got here in Lithgow, with that front coming through, it's certainly making it very difficult for us to get a handle on it," he said.

"We've got aircraft - fixed wing and rotary wing - working on it, have over 20 appliances working on this fire as well as the Fire and Rescue NSW appliances," he said.

"People need to make sure they check the Fires Near Me app for updates and also make sure they enact their Bushfire Survival Plan."

Update 4.46pm

Wind gusts of up to 50km/h are pushing the fast moving Lidsdale grass fire.

An emergency warning has been issued for the blaze, which was sparked on the corner of the Castlereagh Highway and View Street at about 12.45pm. It has since crossed Maddox Lane in the vicinity of Wolgan Road.

The highest level of alert has been issued for Wolgan Road and its surrounding areas in Lidsdale: "Seek shelter as the fire arrives", the NSW Rural Fire Service has urged.

"The fire is burning in an easterly direction under strong winds. Properties along View Street are under threat," Fires Near Me directs.

"Crews are in position along Wolgan Road and Maddox Lane to protect properties.

"Residents in the areas east of the Castlereagh Highway, around Wolgan Road and Maddox Lane, should shelter now as the fire approaches.

"Take shelter in a solid structure when the fire front arrives. Protect yourself from the heat of the fire. If you are caught in the path of the fire, you may die or be injured."

Fire and Rescue NSW Acting Superintendent Rob Jansen said the combined Rural Fire Service and Fire and Rescue NSW crews were concentrating efforts on protecting property.

Twelve Fire and Rescue NSW units are on scene and another six on their way to the fire.

"The crews are concentrating on property protection of buildings in [the area]," he said.

Aerial support is at the scene to help control the blaze, which has burned in excess of 95 hectares.

"It is running through trees and grass and spotting as it goes," Acting Superintendent Jansen said.

Flames are visible in the tree tops and the flames themselves have reached between one and two metres.

Homes are being protected on Maddox Lane and Wolgan Road. No homes are believed to have been impacted, but at least one shed has been lost.

The Lithgow Mercury has received a report of a burning leaf being found in the yard of a home on Inch Street, Lithgow, thrown by the current high winds.

Multiple fire crews and a water bomber are on site at an out of control grass fire at Lidsdale.

The NSW Rural Fire Service estimates 95 hectares has been burned.

The fire broke out at about 12.45pm on Friday, September 6 on the corner of the Castlereagh Highway and View Street.

Crews are now fighting the fire from the air, with a water bomber on the scene as the valley is completely filled with smoke.

More brigades are heading to the site of the grass fire.

A 'watch and act' order is in place for people in the area, so residents should stay alert and be prepared if anything changes.

The Castlereagh Highway is still open with some delays and crews are out directing traffic.

There is no information available about how the fire started at this stage.

The NSW Rural Fire Service Chifley Fire Control centre stated they hoped to soon have it under control but it the wind was "playing havoc" with the blaze.

A fire which broke out at Oberon on Friday afternoon has been brought under control after burning approximately four hectares.

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