Sydney

Floods triggered by heavy rainfall across Australia's southeast coast since last week have once again inundated Sydney and large parts of New South Wales (NSW) state, triggering the evacuation of thousands of residents.

NSW Premier Dominic Perrottet addressed the public on Monday, urging residents in affected areas to follow emergency instructions.

"I want to continue to ask people to follow the instructions of the State Emergency Service (SES). If there is an evacuation warning in place, please get ready to evacuate. If there is an evacuation order in place, please leave immediately", NSW Premier Perrottet said.

Across the state and in Sydney, there are currently 70 evacuation orders in place affecting over 32,000 people.

Seven emergency evacuation centres have been established in the worst affected areas of the state.

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Rain and storm conditions are forecast to continue before easing on Tuesday.

The sudden flooding is in part due to the overflow of the state's major dams which have been at 100 per cent capacity due to Australia's historically wet summer.