A severe thunderstorm that struck the Illawarra about 2.30pm has now swept out to sea.
The Bureau of Meteorology cancelled a severe weather warning at 4.58pm.
The SES has responded to 20 calls for help throughout the South Coast region for trees down, fallen branches and leaking roofs.
The BOM issued a severe thunderstorm warning for the Illawarra this afternoon, raising the likelihood of large hailstones, heavy rainfall that could lead to flash flooding, and damaging winds.
A number of the region’s beaches, including Corrimal and Woonona, were closed due to lightning.
There were also reports of temporary power outages in the Woonona and Russell Vale area, affecting about 4000 homes.
At 5pm, about 150 homes were still without power.
For emergency help in floods and storms, ring the SES (NSW and ACT) on 132 500.