Federal statistics agency Destatis will unveil its flash estimate at 0800 GMT, with leading research institutes forecasting that gross domestic product shrank almost 10 percent between April and June compared with the previous quarter.
Germany has withstood the coronavirus shock better than many of its neighbours.
However, the jobless rate for July held steady at 6.4%, unchanged from June in a sign that the initial effects of the pandemic were easing.
Thursday's data "is a glimpse in the rearview mirror", ING bank analyst Carsten Brzeski told AFP.
A detailed breakdown of what drove the second-quarter slump is due on August 25.
The German government has gone to unprecedented lengths to cushion the economic impact from the crisis, ditching its no-new-debt dogma in favour of massive stimulus aimed at spurring investment and consumer spending.
Germany's bounce-back should also get a lift from the European Union's 750-billion-euro ($883 billion) coronavirus recovery plan.
"The labor market is still under pressure due to the corona pandemic, even if the German economy is on a recovery path", Daniel Terzenbach, regional board of the Federal Employment Agency, said in a separate release on Thursday. German government bonds maintained their gains after the data, keeping yields on 10-year securities down 3 basis points to minus 0.53%.
By contrast, the European Commission expects the economies of France, Italy and Spain to shrink more than 10 percent this year.
Better-than-expected business and consumer confidence surveys recently suggested Germans are feeling more optimistic about the future.
As an export powerhouse, Germany is highly vulnerable to virus setbacks in other countries that could lead to renewed shutdowns that once again disrupt supply chains and suppress demand.
Germany's mighty industrial sector, already feeling the pain from US-China trade tensions and Brexit uncertainty, has been especially hard hit.
The pace of the rebound will rely in part on the effectiveness of the government's €130 billion ($153bn/Dh560bn) stimulus approved in June and how fast can demand for German exports return to pre-pandemic levels.
KfW chief economist Fritzi Koehler-Geib said the German economy had a "successful start" to the summer but it was "too early to give the all-clear".