The Bureau of Meteorology warns very heavy surf is likely to develop along the Illawarra coastline from Thursday afternoon, bringing waves of over five metres.
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Damaging winds with peak gusts of around 100km/h are also expected to hit on Friday.
Beach conditions, especially along south-facing beaches, could be dangerous and people are urged to stay well away from the surf and surf-exposed areas.
The heavy surf might lead to localised damage and coastal erosion, and is expected to persist into Friday.
The severe weather warning comes after the BOM issued a hazardous surf warning on Wednesday.
The conditions are forecast because of a low pressure system off the coast of northern NSW that is expected to move southwards in the coming days.
Boaters are also advised there is a gale wind warning for the Illawarra coast for Thursday and Friday.
Meanwhile, the rain continues and Friday is expected to be the wettest day of the week.
Wollongong might receive 20 to 35 millimetres, Albion Park is forecast to get up to 40 millimetres, while Kiama can expect 25 to 45 millimetres.
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