Bushfire crisis continues: the latest information

The Bureau of Meteorology says we have to swelter through another hot day on Saturday

NSW is expected to get some reprieve from the heat heading into Christmas - but first the state must endure another "dangerously hot" day across coastal areas.

The Bureau of Meteorology warns that Saturday could be even hotter than Thursday, when two firefighters were killed and several others hospitalised.

BOM acting NSW manager Jane Golding said temperatures would again rise into the mid-40s, with Penrith expecting a maximum of 47 degrees and coastal areas hitting the mid-to-high 30s.

"That's dangerously hot weather," she said.

A gusty cool change is also expected on Saturday, which will bring some relief from the heat for central and southern NSW but create dangerous conditions on the waterways and challenging fire conditions.