A five-year-old girl remains in a critical condition after being found unresponsive in a car on Tuesday afternoon.

Emergency services were called to a home in Tanilba Bay, the Port Stephens area, at about 4.30 pm after the girl was found inside a car parked in the driveway of her family's home.

UPDATE: Little girl found unresponsive in parked car placed in induced coma

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She was airlifted to John Hunter hospital in a critical condition.

Detectives are investigating the circumstances of the incident.

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The temperature in Tanilba Bay on Tuesday reached a top of 37.5 degrees just before 3 pm.

It is not known how long the girl had been in the car for.

Police have not laid any charges over the incident.