Hundreds of firefighters will take advantage of cooler weather to strengthen containment lines on about 30 uncontained fires burning across NSW.

RFS Inspector Ben Shepherd says the bushfire threat across the state has eased, but there will still be hundreds of firies out battling blazes today.

“Across the state, we’ve still got over 60 fires of which just under 30 remain uncontained,” Mr Shepherd told Macquarie Radio.

“(There’s) more favourable weather today … but we’ll be out there with literally hundreds of firefighters doing that hot and dirty work trying to get these fires under control.

Cooler conditions today have come after hundreds of firefighters battled dozens of fires across the state yesterday, with fires on the Hawkesbury and in the Southern Highlands causing immediate threat to homes.

Emergency warnings were issued for residents of Lower Portland on the Hawkesbury River and for Alpine south of Sydney as temperatures soared into the thirties in the afternoon.

About fifty properties came under threat at Lower Portland.

Those fires have now been downgraded to advice level, along with the fire burning at Howes Swamp in the Hawkesbury.