Gert Jordaan, founder of UFO Research of SA, said that between February 21 and February 27 many people reported seeing bright orange lights and flames in the sky.
He said that while some sightings could be attributed to meteor showers, others could have a more interesting explanation.
"Though meteors do glow orange, some of the sightings reported radical change in direction and speed. Some objects even remained stationary for five minutes or so. There might be some UFO phenomena occurring in areas around Cape Town," he told the Times newspaper.
Mr Jordaan said one other explanation was that there could be "some top-secret aircraft" being tested in the Western Cape.
"The second possibility is that life from another planet is surveying ours for making contact and offering knowledge."