Two women and a dog have been rescued from a car in floodwater on the NSW Far North Coast.

The trio were stranded in a causeway at Billinudgel on Sunday afternoon when they were plucked to safety by State Emergency Service volunteers as heavy rain continued to fall in areas from Port Macquarie up to Lismore.

The rescue was the first as a result of this week's heavy rainfall, SES spokesman Phil Campbell said on Sunday.

"There's only been one flood rescue, which is really good news," he said.