Soaring temperatures and vigorous winds are forecast to fan another "significant spike" in bushfire conditions across NSW.

Bureau of Meteorology spokesman Grahame Reader said there are widespread forecasts of very high-to-severe NSW fire danger for Friday.

"After a relative respite in the weather this week we are expecting another significant spike in (fire) conditions," he told reporters on Thursday.

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"We will have hot and dry northwesterly winds and later in the day a vigorous southerly change will be moving through."

READ MORE NSW government commits additional $1 billion to bushfire recovery

Temperatures could reach the mid-40s in western NSW before the southerly moves through on Friday afternoon, Mr Reader said.

"Hot and dry conditions fan fire behaviour. Of significant concern is the gusty southerly change moving through," he said.

Bushfire weather across NSW is forecast to ease into the weekend.

NSW fire crews have this week taken advantage of cooler conditions as they battle to control several blazes ahead of the forecast heat.

AAP Image/Dean Lewins

Authorities, meanwhile, have confirmed that 1870 NSW homes have been destroyed since the start of the fire season, with more than 750 damaged.

More than 950 have been confirmed destroyed in 2020 alone.

Almost 200 facilities and 3774 outbuildings have also been razed.

NSW Rural Fire Services spokesman James Morris said crews will work on backburning and strengthening fire containment lines ahead of Friday.

Residents around bushfire areas are advised to continue to monitor the situation as conditions can change quickly, he said.

The favourable conditions have helped energy crews restore power to most south coast and southern highlands communities after bushfires caused widespread damage over the weekend.

The NSW government has also announced it will tip an extra $1 billion into bushfire management and recovery.

Premier Gladys Berejiklian said the funding would prioritise infrastructure repair and help stimulate fire-ravaged communities over the next two years.

"That can range from a bridge to a road, to a rail line, to a school, a hospital, or it can also extend to communications and energy infrastructure," she said.

More than 120 fires continued to burn across NSW on Thursday afternoon, with more than 2500 firefighters on the frontline.

Since July, 20 people have died in the NSW bushfires, as well as 6200 livestock and millions of wild animals.

with AAP...