Bureau meteorologist Shuang Wang said this weekend’s chill was thanks to “a complex low [that] generated a serious cold front”.
Sydney Airport recorded wind gusts of 72km/h on Sunday afternoon, making the temperature feel 10 degrees cooler.
“If you’re near the coast or against the wind it will feel much colder,” Mrs Wang said.
Monday is forecast to reach 17 degrees in Sydney with westerly winds easing, although powerful surf conditions will persist and make rock fishing and surfing hazardous.
“[There] could be some wind in the morning but it’s going to be much more settled by evening,” Mrs Wang said.
“For the rest of the week there’s a high pressure system that’s dominating the region [with] mostly sunny conditions.”
Tuesday’s maximum for the city is expected to be 16 degrees before the temperature climbs to 21 on Friday.
“It’s most likely sunny to partly cloudy continuing throughout the week and the temperature is going to go up, especially during the later half of the week,” Mrs Wang said. “It’s like spring is coming.”
Saturday is tipped to reach 24 degrees with the bureau predicting Sunday will hit 26.
This weekend’s cold weather provided a welcome boost to the snowfields and ski resorts battling through COVID-19 restrictions.
Thredbo received 78 centimetres of snow since Tuesday. Perisher recorded 91 centimetres in the same period, including 25 centimetres since Saturday.
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Josh Dye is a news reporter with The Sydney Morning Herald.