The Bureau of Meteorology has forecast a cool change for the region coupled with wet conditions which should set in Friday morning and continue over the weekend.

Bureau forecaster Rose Barr said the rain is associated with a front moving across the state.

Temperatures will start to drop into the high 20’s and low 30’s on Thursday and low to mid 20’s on Friday.

In Maitland between 15 to 30mm of rain is forecast on Friday, Singleton is expected to receive between 15 to 35mm, Cessnock 15 to 33mm and Newcastle 10 to 25mm.

News of the wet weather forecast comes just days after the Bureau of Meteorology reported that September 2017 in NSW was the State's driest start to spring on record.

Rainfall was 86 per cent below average for the State, and the lowest on record for areas of the east coast and southwest.

After some cold days at the start of the month, two blasts of warm air towards the end of September broke records for the warmest September day when averaged over the State, and highest temperature recorded anywhere in NSW during September.