Flights at Sydney Airport delayed due to gusty winds

Up to 70 flights have been cancelled in and out of Sydney Airport, Australi, as strong winds buffet the runways.

A Sydney Airport spokeswoman said planes were restricted to using only one runway due to the gusty conditions on Thursday.

Passengers are being urged to check their flight details with their airlines. 

The strong winds are also hampering efforts by firefighters attending to an out-of-control fire that is burning at Summercloud Bay, near Jervis Bay, on the state's South Coast. 

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The fire is burning in the area of Wreck Bay Road and is spreading in a northerly direction towards Jervis Bay Village. The Booderee campground has been closed.

The Large Air Tanker, Thor, has been called out. The RFS is calling for those in the area to seek shelter.

Thursday's blustery conditions come a day after Sydney experienced its hottest September day in 159 years, when windy conditions increased the fire risk across the state. 

The heat was fairly uniform across the Sydney basin on Wednesday, with most suburbs reaching at least 33 degrees. Sydney Airport hit 35.3 degrees and Bankstown 35 degrees.

The previous warmest temperature this early in the month for Sydney was 32.2 degrees on September 13, 2009, a level beaten by 1.6 degrees yesterday.

Despite conditions easing overnight more than 90 fires are burning across NSW with about 30 of them out of control.

Firefighters remain focused on containing the fires, which  threatened homes in the NSW Hunter region and Mid North Coast.

"Once the winds pick up, it will flare the fires again. By no means out of the woods. A lot of work to be done on the fire grounds today," RFS Inspector Ben Shepherd told the ABC on Thursday.

He said the ground was "extraordinarily dry".​

- With AAP

 - Sydney Morning Herald