Daily Bild had reported earlier that the meteorologist for public broadcaster ARD was arrested on Saturday at Frankfurt Airport upon his return from Canada, where he had been covering the weather during the Olympics in Vancouver.
Originally from Switzerland, the 51-year-old Kachelmann allegedly forced his girlfriend to have sex in her apartment in the Rhein-Neckar county in February after they had an argument.
“The accusations are wrong and completely made up,” Kachelmann's lawyer Ralf Höcker.
Prosecutors said they decided to arrest the affable meteorologist and television presenter since there was danger he could flee the country.
But Stefanie Schlesz, a spokeswoman for Kachelmann's firm Meteomedia, said she was confident he would soon be released from jail.
“We believe this to be a misunderstanding that will most certainly be cleared up soon,” she said.