The family had been visiting Mango Hill in Queensland’s Moreton Bay region when they returned from a picnic to discover the serpent.
They called snake catcher Josh Castle, who deployed his someone to safely remove the intruder from the “distressed” family’s vehicle.
Mr Castle said the snake crept into the car via cracks in the windows, left open by the family to keep their car cool.
“Snakes love squeezing into tight areas, including under car bonnets, under decks etc,” Mr Castle said.
He added the wet weather may have caused the carpet python to seek shelter.
“The weather can definitely play a big part. Flooding will makes snakes seek higher ground.
“Only piece of advice I can give is wind the window up.”