Rain is set to ease bushfire conditions and provide much-needed relief for NSW fire crews who are focused on strengthening containment lines across active blazes.

NSW Rural Fire Service spokesman Anthony Bradstreet said fire conditions are expected to ease on Monday and throughout the week with rain on the horizon.

“We would love rain everywhere,” he told AAP on Monday.

“Hopefully we will receive some good rainfall in fire affected areas.”

Rain is forecast for pockets of the central and northern coasts on Monday, with thunderstorms and showers forecast for most of NSW on Thursday when up to 25 millimetres is expected to fall on parts of the South Coast.

“If this @BOM_NSW rainfall forecast comes to fruition then this will be all of our Christmas, birthday, engagement, anniversary, wedding and graduation presents rolled into one. Fingers crossed,” the RFS tweeted on Monday.

Mr Bradstreet warned thunderstorms could create the risk of falling trees and landslips.

Advertisement
Advertisement

Crews will take advantage of the easing conditions to establish and strengthen containment lines for some 40 bushfires which are not yet contained, he added.

The RFS has said there are more than 100 fires still burning across the state and many will take some time to fully contain.

Air quality across much of the state including Sydney was very poor on Monday as a result of smoke from the bushfires.

Hazardous air quality was recorded in parts of Sydney’s northwest, southwest, the Illawarra, Albury and Wagga Wagga.

Firefighters on Sunday brought under control one of the county’s most damaging blazes – the Gospers Mountain fire which has burned for two-and-a-half months northwest of Sydney.

“After lightning started the fire on October 26, it has burnt through more than 512,000 hectares across the Lithgow, Hawkesbury, Hunter Valley, Cudgegong, Blue Mountains and Central Coast local government areas,” the Hawkesbury RFS said on Facebook.

Advertisement
Advertisement

“It is important to remember not to be complacent as there are still a few months of the bushfire season to go with some bushland that still has not been burnt.”

AAP