In what sounds like a scene from the 70s movie Close Encounters of the Third Kind, people in South Australia and western Victoria have deluged police and media with reports of a spectacular meteor sighting.

Police in SA said they took calls from just after 8pm (CST) on Monday from Renmark and Loxton in the Riverland, most Adelaide suburbs and then from people living south of the city, with reports of something looking like a fireball in the sky.

In Victoria, callers to ABC Radio, from Bendigo to Horsham in the state's north-west down to Colac in the south-west, reported seeing a bright green coloured object shooting westward in the sky.

"It was green like a meteorite or shooting star," he told ABC Radio.

"It was really pretty bright and you could see something else coming down as well, but what it was I don't know."

Monty from Kaniva, near the SA border, said the object was bright and appeared to have debris trailing behind it.

"It was before sunset and normally you only see those things in the dark," Monty said.

"The trail hung in the sky for at least 15 minutes afterward like a jet stream."

Allen at Colac said: "I was sitting at the Shell servo at Colac and I was looking to the north and you could see the green light with the tail thing behind it."

Brian, who owns a farm at Laanecoorie, west of Bendigo, said he and his wife were outside when they saw the comet-like object streak across the sky.

"We looked up and there was a green comet-like thing dropping out of the western sky," Brian said.

"It dropped over the trees at the back of our property and it was making a tail as it went down."

An SA Police spokesman said later that the Bureau of Meteorology confirmed the object was a meteor