The Bundesbank said the positive effect from the weather would likely dampen the seasonally-adjusted rate of gross domestic product (GDP) growth in the second quarter for mathematical reasons.
"GDP growth will nevertheless probably be relatively weak in the spring in seasonally and calendar-adjusted terms," the Bundesbank said in its monthly report.
It said the economic upturn in the coming months would be largely based on domestic demand while impetus from abroad would be "rather subdued".
It also said the potential for external disruption had "increased noticeably" of late due to economic risks in some emerging markets and significant geopolitical uncertainties in eastern Europe.
(Reporting by Michelle Martin; Editing by Madeline Chambers)