Police have warned drivers to avoid Godstone Road, which is now completely closed because of flooding. The stretch between Purley and Surrey is affected. Work is also needed at a treatment works along the route.
A 'major incident' has been declared by Croydon Council after roads were closed due to flooding.
Firefighters were brought in to pump water away from a sewage works, and will do so throughout the weekend to try and keep the plant open. Parts of Kenley, Purley and South Croydon are on alert, and the A22 Godstone Road has been closed.
1,500 residents were handed leaflets to warn of possible flooding, and this afternoon parents were asked to collect their children from school early. Council leader Mike Fisher urged residents to be vigilant:
Antony Levin, the general manager of Carlton Mitre Hotel in Kingston-upon-Thames has told ITV London that flooding over Christmas has forced parts of his business to close.
Mr Levin said the establishment had been flooded six times since Christmas day and that he hoped the floods would subside soon so that trading could resume.
Kate MccGwire, an English sculptor has spoken of her fears for her art studio on her boat being damaged by flood waters.
MccGwire told ITV London: "It's very worrying, I lie in bed at night in my house worrying about it all the time".
Thames Barriers are being "stretched" to help flood-affected areas, Tidal Defences Operations Manager told ITV London, as southern parts of England brace for more bad weather.
Andy Batchelor added that they were "on the bounds" of protecting property around the river.
London must step up its flood protection or risk being swamped in future, the Environment Agency’s chief told the Evening Standard.
The former Cabinet minister warned London's ageing drains could be overwhelmed by increasingly extreme weather patterns.
He said: "We have a Victorian drainage system that was brilliant when it was built, but we have increased the number of people and properties on top of it by rather a lot since then.
“And since then we have concreted over very large parts of London, which means any rain that falls goes straight into the drains rather than being absorbed into the ground.”
The Environment Agency has issued 72 flood warnings for the south east, in which immediate action is required, as heavy rain continues to bring travel misery to commuters.
Areas around the River Thames including Greater London, Hertfordshire and Surrey are expected to be worst hit by the downpours this weekend.
An amber warning for severe rain has been issued for London and parts of south east England, urging people to be prepared for floods this weekend.
A Met Office forecaster said in a statement: "An area of low pressure and its associated frontal system gave some 15-30 mm of rain on Thursday night across many southern areas. This has led to further flooding in places.
"A further Atlantic frontal system will bring a band of rain quickly eastwards during Friday night and early Saturday, with the heaviest rain again likely to be across parts of southern England, followed in turn by heavy showers.
"Another 10-20 mm of rain (and perhaps locally 30 mm on high ground) will fall in the Amber area, leading to further flooding".