Forecasts are for up to 25 millimetres rainfall in the city, as tropical moisture causing flooding in much of NSW travels south.

The Bureau of Meteorology has warned that Bendigo is in the region likely to get some of the heaviest falls in Victoria on Sunday, with a chance of a thunderstorm.

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Forecaster Ilana Cherny said the north central parts of the state were likely to get the most rainfall. She said rainfall in Bendigo was unlikely to set the record, but would probably be decent.

Miss Cherny said Victoria's rainfall was associated with a low pressure trough dragging moisture south from NSW.

"We're really just getting the edge, and so our effects are much less significant than what is currently happening in NSW," she said.

"We're not expecting falls in Victoria to reach that type of magnitude of the 100s of millimetres in a day."

Miss Cherny said Victoria was likely to have a couple of wet days, as another trough formed. She said Monday's rainfall was likely to be heaviest in the northern parts of the state, while the heaviest falls would probably be in the east on Tuesday.

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Heavy rain that continued overnight to Sunday has left rivers across the NSW threatening to flood. People in some areas were told to leave homes in the middle of the night.

Scenes from Saturday included burst banks, gushing water and even a house washed down a river.

Saturday marked the worst flood event in NSW in more than three decades, with Premier Gladys Berejiklian warning the rain may continue until Thursday or Friday.

With AAP.

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