Two homes have been lost, another damaged and 16 other buildings destroyed by bushfires in the State's south while blazes in the north also threatened residences.

Almost half of the 79 blazes still alight across NSW on Thursday evening were out of control.

NSW Rural Fire Service Inspector Ben Shepherd said favourable conditions yesterday, similar to those on Thursday, helped firefighters backburn and use other methods to contain the blazes.

"But they won't all be under control before Saturday," he told AAP.

"We'll be doing as much as we can before those winds increase on Saturday."

Westerlies reaching 40kph are predicted for Sydney on Saturday while the chance of rain is just five per cent.

At Ulladulla, where residents evacuated when the Mount Kingiman blaze proved dangerous earlier in the week, winds of up to 50kph winds are forecast for today.

Two separate blazes in Ellangowan and Ramornie in northern NSW were the final fires to be downgraded from watch and act warnings to advice messages on Thursday evening.

The RFS earlier confirmed the Bemboka fire on the South Coast had burnt down two homes and four outbuildings in the Bega Valley, while 11 outbuildings were lost in the Mount Kingiman blaze nearby.

One home was confirmed damaged in the North Nowra blaze.