Fire restrictions will be extended at least to the end of April in many parts of NSW as the ongoing drought continues to elevate bushfire risks, the Rural Fire Service said.

The one-month extensions cover most of northern NSW, such as the Far North Coast and Northern Tablelands, but also the Hunter Valley, the Southern Tablelands and the Riverina Highlands.

Dust near Narrandera: cooler weather doesn't mean the fire season is over. Credit:Nick Moir

"Most of the state remains extraordinarily dry," said Ben Shepherd, a senior RFS spokesman, adding the prolonged fire season comes even after the state "had such a dramatic start to the fire season."

Dust storms continue to feature across large swathes of the state - including on Friday - underscoring the severity of the prolonged dry spell.