Heavy rain made playing conditions almost impossible and the visitors were hardly helped by the early dismissal of goalkeeper Tim Wiese.
Mehmet Ekici put Werder ahead against the run of play but Philipp Wollscheid earned his side a deserved point with his second-half goal.
The conditions were poor but it was no excuse for Werder's goalkeeper Tim Wiese, who was sent off after 16 minutes when he brought down Nurnberg defender Christian Eigler outside of the penalty area.
That meant striker Marko Arnautovic had to make way for replacement goalkeeper Sebastian Mielitz, with the home side peppering the substitute with shots on goal
However, in their first attack and totally against the run of play, Werder went ahead thanks to a Ekici goal.
The midfielder slipped the ball past the oncoming defence and scored from eight metres out.
The driving rain in Nurnberg delayed the start of the second half by 20 minutes to allow an improvement in pitch conditions.
When play finally got under way, 10-man Werder sat back and focussed on their defence, making no further attacks on the Nurnberg goal for the entire match.
But it was to their detriment, as Wollscheid equalised for the home side in the 62nd minute.
Markus Feulner spotted a gap in the Werder defence and launched a right-footed inswinger to Wollscheid, who received the ball to score an excellent equaliser.
That was the last real action in the match, as the pitch deterioration made further chances few and far between.