Live: Sydney gets a drenching as heavy rain, severe weather ...

Reporting by Adriane Reardon from the ABC South East NSW newsroom.

Six people, including two children, have been taken to hospital with injuries following a crash in wet weather south of Mudgee in the NSW central west.

Emergency services were called to the two-vehicle crash on the Castlereagh Highway, about 2pm today, where a ute and four-wheel drive had collided.

The male passenger in the ute, believed to be in his 60s, was flown to hospital with serious injuries, while the male driver, 55 was taken to Mudgee Hospital.

The driver of the four-wheel drive, a 34-year-old man, was also flown to hospital with serious injuries, while his 32-year-old female passenger was flown to hospital with critical injuries.

Two children in the back-seat, aged two and six, sustained minor injuries and taken to The Children’s Hospital at Westmead for observation.

A crime scene has been established and an investigation is underway.