SES media officer Dave Rankine said since 7pm on Friday, the Kiama unit responded to 67 jobs, while Wollongong responded to 95.

He said attention was turned to Nowra on Monday, with the Bureau of Meteorology predicting the Shoalhaven River to hit its biggest peak in 29 years.

A flood alert has been issued for Nowra and Terara.

11am: Trains have resumed between Thirroul and Waterfall on the South Coast Line.

The rail line was temporarily at a standstill due to a tree branch caught in overhead wiring at Otford earlier today. Buses will continue to supplement services.

Also, buses continue to replace trains between Port Kembla and Port Kembla North due to flooding at Port Kembla.

Passengers are advised to continue to allow extra travel time, listen to announcements and check information displays on platforms.

Meanwhile, a flood alert has been issued for Nowra and Terara with water levels continuing to rise on the Shoalhaven River.

The Shoalhaven River at Nowra is currently at 4.13 metres and peaking with near major flooding.

The Shoalhaven River at Terara is currently at 3.89 metres and peaking with near major flooding.

10am: The Albion Park drive through COVID-19 testing clinic will not be open on Monday due to poor weather.

The drive-through testing clinic, operating at the Albion Park Showground, will resume operation from 8am Tuesday 11 August, weather permitting.

8.37am: Buses have been confirmed to replace trains between Coalcliff and Helensburgh and are on their way to Thirroul and Waterfall.

8:30am: A severe weather warning for gale force winds and hazardous surf remains in place Monday morning for the Illawarra.

Wind gusts averaging 60 to 70 km/h are currently occurring on the Illawarra and Sydney coast, but will ease throughout the day as the weather pattern shifts north.

A trough along the New South Wales coast, together with multiple low centres within the trough, are bringing increased winds and surf along the southern and central parts of the coast. The areas of winds and surf should shift to the northern coast on Monday as the system heads north.

The BOM advises with waves exceeding five metres in the surf zone, it may lead to significant beach erosion along coastal parts of the Illawarra, Sydney and Hunter coast on Monday.

"Beach conditions in these areas could be dangerous and people should stay well away from the surf and surf exposed areas," their website said.

"Surf conditions should ease in the south later Monday, but hazardous surf conditions should persist until Tuesday."

8:10am: Illawarra rail commuters will find it harder getting to work on Monday as the weekend weather has caused problems with the train line.

Trains are not running between Coalcliff and Helensburgh due to a tree branch caught in overhead wiring at Otford.

Replacement buses are being organised to run between Thirroul and Waterfall, but as of 8am were not yet on site. Buses are also replacing trains between Port Kembla and Port Kembla North due to flooding at Port Kembla

7:45am: Wild weather is beginning to ease across the Illawarra after damaging winds and heavy showers pelted the region Sunday night.

As a result, the RMS has closed the Illawarra Highway between Princes Highway and Tongarra Road both directions due to flooding. Motorists are advised to take Tongarra Road instead and proceed with caution.

However, there is also flood water affecting Tongarra Road between Croome Road and Terry Street, with a reduced speed limit to 40km/h.

At Berkeley, the Princes Motorway southbound off-ramp to Northcliffe Drive was closed overnight.

Heading towards Campbelltown, Douglas Park Drive (Causeway) at Nepean River at Douglas Park is closed in both directions due to flooding.

Just past Robertson, Sheepwash Road is closed in both directions between Illawarra Highway and Kangaloon Road.

Near Fitzroy Falls, fallen trees and a rock slide are causing havoc for motorists on Moss Vale Road/Nowra Road. Motorists should reduce their speed and proceed with caution.

At Nowra, there's water on the road on the Princes Highway at Kalandar Street. Motorists should proceed with caution.

While streets around Nowra which remain closed due to flooding, as of 7:45am Monday, include:

For up-to-date information on road closures in the Shoalhaven, visit: https://www.shoalhaven.nsw.gov.au/Emergencies/Road-Closures

Over the weekend, SES media officer Dave Rankine reminded residents never to drive, ride or walk through water during floods.

"We just want to remind the community that no matter how big their four-wheel-drive is, or how good they think they are at driving - please don't attempt to cross flood waters," he said.

"Some of our units have been spending a lot of time turning people away from flood crossings, when they could have been spending that time attending to jobs. It's not safe to be crossing flood waters - it puts you and our volunteers at risk."

Meanwhile, Sunday night's weather left 3,500 Endeavour Energy customers without power throughout the night on the South Coast, Southern Highlands and Hawkesbury regions.

A spokesperson for Endeavour said the storm caused more than 150 electrical hazards from fallen trees and branches over powerlines.

Emergency crews are currently patrolling storm damage and working to safely restore power supply to affected customers.

Localised flooding on parts of the South Coast are hampering crews on Monday morning from accessing damaged parts of the network in some areas.

Residents are reminded to stay at least eight metres clear of damaged powerlines and report them by calling our emergency line 131 003.

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