Wärmegård had been in Le Zoo bar with a group of friends at left at around 1.30am Sunday night to walk the 500 metres to his home at a student residence.
There has been no trace of him since.
“I fear that an accident has occurred. But my hope is that he has been abducted,” said Nils’ father Per Wärmegrård to Aftonbladet.
French police have been informed and they are now searching for Wärmegård. Posters have been put up across Le Mans by friends to assist the police effort.
According to Arne Kallin, press officer at the Swedish embassy in Paris, police have deployed significant resources to search for the man.
“They are trying to locate witnesses and have studied surveillance films. But no one has seen him,” he told Aftonbladet.
Nils Wärmegård, from Kramfors in northern Sweden, moved to France to work as an acrobat with a circus group based in Le Mans.
According to his family who are now in France helping police with their enquiries it is very unlike him to go off without telling someone.
“This is our worst nightmare. But we are not giving up hope,” Per Wärmegård said to Aftonbladet.