Over the past 12 months, NRMA Roadside Assistance has rescued over 1400 children or pets trapped in cars across NSW.
NRMA traffic safety expert Dimitra Vlahomitros said most of these cases are accidental and a person’s keys are also locked in the car.
She urged motorists to know where their keys are before closing the trunk or car doors.
Ms Vlahomitros said leaving a child or pet locked in a car on a hot day is not only dangerous but also illegal.
Parents can be fined up to $22,000.
“While we have had a respite after some 40+ degree days this summer in Sydney, it is illegal and dangerous to leave children in a car at any time,” Ms Vlahomitros said.
Families are reminded to remain calm if the accident occurs as it can be distressing for both the child and the parents.
“It’s the hardest thing for a parent to go through,” Ms Vlahomitros said.
It comes as Sydney experienced a sudden heatwave this week, recording temperatures above 30 degrees.
Temperatures are expected to cool down in Sydney for Christmas, ranging from the mid to high twenties.
It’s mostly sunny in Sydney today with highs of 29 degrees.
NSW residents are making the most of the suddenly warm weather by heading to the beach and rivers to soak up the sun.
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The past few months have been marked by wet and cold weather due to La Niña conditions in the country.