Erdogan is due to open a mosque built by a group with ties to Turkey in the city on Saturday.
Several thousand people also demonstrated against the Turkish leader in Berlin on Friday night.
He had breakfast with German Chancellor Angela Merkel in Berlin on Saturday.
Germany and Turkey have clashed over numerous issues in recent years, including Turkey’s jailing of German journalists.
The rhetoric escalated to the point where Mr Erdogan called Germany’s mainstream parties “enemies of Turkey” and accused German officials of acting like Nazis, prompting Mrs Merkel to condemn his comments.
Press Association