Wind gusts up to 100km/h forecast to hit Sydney, Hunter and Illawarra regions this afternoon

The NSW State Emergency Service is preparing for calls across the Sydney metropolitan, Hunter and Illawarra regions with damaging winds of up to 100km/h expected over the next two days.

The SES had responded to about 15 jobs on Monday morning, mainly in Sydney metro area.

"We anticipate there will be some more requests for assistance coming through, due to the fact there's a severe weather warning currently for damaging winds," an SES spokeswoman told AAP.

According to the Bureau of Meteorology forecast, winds averaging 55km/h to 65km/h with gusts to about 100km/h are set to develop in Sydney, the Hunter and Illawarra on Monday afternoon and evening.

The SES said there is also some rainfall forecast in the same areas for Monday, which are not yet included on the warning.

Rainfall could be 40-60mm across most of those areas, with up to 100mm in some places.

"(We're) waiting for it to develop," the spokeswoman said.

Dangerous surf conditions are also expected to develop on Monday.

The SES is advising people to move their cars under cover, secure loose yard or balcony items and keep clear of fallen powerlines.

Send your wild weather photos and videos to contact@9news.com.au but remember to stay safe.