St George and Sutherland Shire residents can expect a grey and wet end to the school holidays, with showers set to persist for at least the next seven days.
Almost 8 millimetres of rain has fallen at Sydney Airport in the past 24 hours to 9am (following 35mm to 9am on Friday).
At least 2.5mm of rain fell at Lucas Heights on Sunday (following 12.mm on Friday).
Showers are expected to continue steadily throughout Monday, with up to 5mm predicted along the coast.
"We have a trough that's sitting off the coast at the moment and it's bringing these south-easterly winds of between 15 and 30 kilometres per hour and pushing showers onto the coast," meteorologist Elli Blandford of the Bureau of Meteorology said.
Temperatures are expected to remain moderate for the start of the week, with Sydney's to hit 21 degrees on Monday, with a maximum of 25 degrees on Tuesday.
Tuesday will also see showers on and off throughout the day, with a maximum rainfall of about 2mm in central suburbs. Offshore thunderstorms are also predicted.
A cold front will sweep through Sydney on Tuesday evening, bringing with it a temperature drop of about six degrees on Wednesday morning.
"The cold front is going to be bringing quite a strong southerly change on Tuesday evening," Ms Blandford said.
"[It will also] bring showers for the couple of days after."
Temperatures will drop slightly again on Thursday hitting a maximum of 18 degrees, but it will remain mostly dry with just a slight chance of showers.
On Friday, the cold front will rear its head again, possibly bringing a couple more showers before it heads off the coast.
"Friday might see precipitation with that cold front before it moves away from the state," Ms Blandford said.
Temperatures will rise back up to moderate over the weekend, hitting 18 degrees on Saturday and 20 degrees on Sunday, but showers will linger heading into the following week.
"There looks to be a chance of a shower or two on Saturday and Sunday, but definitely not as much as what we saw for the weekend just past," said Ms Blandford.
Parts of Sydney received more than 70mm during Thursday evening and Friday morning, exceeding their rainfall average for October, just five a few days into the month, as heavy rain lashed the state.
"[It was] pretty significant rainfall. Over the evening and overnight we did see roughly 50-70 millimetres around Sydney," he said.
The downfall continued throughout Friday, with Cantebury and Sydney's CBD both receiving a further 18mm from 9am to 5pm, while the Olympic Park had 17.2mm.
A Bureau of Meteorology spokesman said the rain was not record-breaking, but the totals were well above the October average for many parts of the state.
"Sydney Olympic Park got 71mm [on Thursday night],” he said.
"For Sydney Olympic Park the average rainfall in October is 64.9mm, so [it's] already exceeded the monthly average in 24 hours.”
The heavy rain caused havoc with emergency services responding to calls of fallen trees, leaking roofs and flash flooding.
Firefighters from Hurstville and Fire & Rescue Kogarah worked alongside the Kogarah SES Unit, when a tree fell across the roof of a house at Connells Point and into the lounge room.
Crews worked to stabilise the tree during chainsaw operations to avoid any further damage to the house before Hurstville's Heavy Rescue fire engine was used to winch the tree from the house.
