The State Emergency Service has responded to more than 300 calls for help across the Illawarra and Shoalhaven in the past 24 hours.
Volunteer crews have been called to at least 57 jobs in Kiama, Shellharbour and Wollongong today.
An SES spokesman said the majority of calls along the South Coast had been from Nowra where gutters frozen due to hail had been causing flooding and leakage problems.
The Bureau of Meteorology this morning renewed a severe weather warning for the South Coast and Illawarra as a deepening low pressure system rolls its way north.
Gales, heavy rain and dangerous surf conditions struck this morning.
At Kiama, peak wind gusts of 95kph were recorded at 9am.
Albion Park Airport weather station has recorded 46.4mm of rain since 9am yesterday.
Wind gusts have so far peaked at 89kph at 8.48am today.
At Bellambi, 49.4mm of rain has been recorded since yesterday morning.
Wind gusts of 93kph were recorded at 11am.
At 8.30am the temperature at Bellambi was just 6.1 degrees.
There have been reports of snow at Gerroa and further south at Vincentia.
Hail has also been reported across the Shoalhaven and southern parts of the Illawarra.
Large amounts of small hail fell at Sussex Inlet around 3am from a slow-moving thunderstorm.
Snow is affecting driving conditions on the Hume, Federal and Kings Highways and the SES is urging extreme caution when driving through these areas.
The bureau has urged people to stay out of the water with ocean swells up to six metres and large waves reaching more than two metres expected to buffet the coastline.
All Illawarra beaches, except North Wollongong Beach, are closed.
The heavy surf may also cause coastal erosion at some Illawarra beaches.
A flood warning for the Shoalhaven River Valley was also issued yesterday, with the SES advising residents to watch the weather and look out for floodwaters near their properties.
Ulladulla has recorded 231mm of rain in the 24 hours to 8:30 am today.
Burrill Lake has reported 298mm for the same period.
For emergency help ring the SES on 132500
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