Much of NSW is facing torrential rain and thunderstorms over the next few days, with severe weather and flooding expected.

The Bureau Of Meteorology has issued a severe weather warning for heavy rainfall has been issued for the mid-north coast from Thursday.

Towns likely to be affected include Coffs Harbour, Port Macquarie, Taree, Woolgoolga, Sawtell, Bellingen and Dorrigo.

As catchments are relatively full on the mid-north coast, flash flooding and flooded rivers are possible.

Heavy rain may also spread to the Lower Hunter, Sydney and Illawarra areas on Friday and Saturday while strong and gusty winds and some larger waves may also develop from Friday.

Residents and visitors in affected areas should monitor weather warnings in the coming days.

AAP

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