The Bureau of Meteorology on Friday morning issued a severe weather warning that stretches along the coast from the south of Wollongong up to Lismore in the north.
Sydney has had its wettest period since March last year with 70mm falling on the CBD overnight.
More rain has fallen in six hours than has fallen in the last three months combined.
The NSW State Emergency Services (SES) has received around 215 calls for assistance since midnight and more than 500 since the rain started on Wednesday.
A number of roads were closed around Sydney this morning due to flooding, sparking very heavy traffic right across the city.
And it isn’t just traffic that has been impacted by the rain, with pictures showing an office in the CBD completely flooded as a result of the wet weather.
If the Bureau of Meteorology’s upper rain forecast is correct, Sydney could see just shy of 400mm of rain over the next week. That’s more than three months’ worth of rainfall in a single week.
More to come.