Floodwaters rising in NSW's central west

Four drivers have been rescued from floodwaters in the NSW central west with the SES on standby as rain continues to fall.

Emergency services are frustrated drivers have not heeded repeated warnings to stay out of floodwaters, with four rescues carried out before 1pm on Wednesday.

Three of the rescues by police and SES were in the Dubbo region and one was in Perthville, near Bathurst.

The weather bureau has issued five flood warnings for NSW rivers.

Residents in the NSW town of Canowindra, near the Belubula River, are in the eye of the storm, with a major flood warning issued.

Up to 27mm of rain has fallen in the region, west of Orange, since 5pm Tuesday and more is expected until at least Wednesday night, according to the Bureau of Meteorology.

The SES says some roads could be closed depending on how much rain falls.