One, an 18-year-old, was knocked unconscious by a wave and suffered a head injury, and the other, a 15-year-old, suffered a hip injury and back pain.
Both are in a stable condition.
A Tasman low brought wild weather to parts of the state on Tuesday, with wind gusts exceeding 100km/h at Wollongong and reaching 87km/h at North Head in Sydney.
The Bureau of Meteorology has issued a warning for dangerous surf and hazardous surf this week. Peak waves exceeding 10 metres were measured just offshore of Sydney on Tuesday evening.
The NSW Police marine area command said that, due to the conditions, people should consider staying out of the water and avoid walking near surf-exposed areas.
Waves exceeding six metres were recorded at Bondi Beach and Cronulla Beach before 9am on Wednesday.
The conditions sparked fears for a surfer seen struggling in the water 200 metres from Coogee Beach on Tuesday afternoon. However, the surfer, who had made his way safely to shore and was unaware of the search, contacted police on Wednesday.
Sydney’s Manly ferry was replaced by a bus service for the second day in a row on Wednesday due to rough conditions.
“Passengers are advised to allow extra travel time and check information displays at wharves for service updates,” Transport for NSW said in a statement.
The Bureau of Meteorology’s Shuang Wang said it would still be “pretty windy” in Sydney on Wednesday, although most of the week’s rain has already fallen.
“There could still be some lighter showers for the coastal fringe,” she said.
After a drenching before dawn on Tuesday, Sydney recorded more modest rainfall in the 24 hours to 9am on Wednesday, with 16 millimetres recorded at Bondi and Little Bay in the city’s east and 15 millimetres at Observatory Hill.
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Mary Ward is a reporter at The Sydney Morning Herald.
Matt Bungard is a journalist at The Sydney Morning Herald.