FRANKFURT—Export orders for Germany's important manufacturing industry rose sharply in June in a trend that should bolster industrial production in Europe's largest economy over the next few months, despite a slowing Chinese economy and lingering concerns about Greek debt.

Data from Germany's economics ministry showed Thursday that manufacturing orders, adjusted for seasonal swings and inflation, surged 2.0% in June from the previous month, bringing the volume of total orders back to levels last seen in April 2008.

"The trend in orders is clearly pointing upwards," indicating an ongoing, albeit modest, expansion in German industry, the ministry said.

But economists warned that the data—beating forecasts of a 0.2% monthly increase—were inflated by an unusually high volume of bulk orders.

AIDA Cruises, a German cruise line which belongs to Carnival Corporation, placed orders in June for two new ships with Meyer Werft in Lower Saxony. Airbus Group SE, which builds single-aisle planes in Germany, also reported strong aircraft orders during June's Paris Air Show.

"Excluding such effects, demand was up a more moderate 0.3%," said Andreas Rees, UniCredit's chief German economist.

Strong foreign demand also bolstered manufacturers' order books in June, the ministry said, with a weaker euro exchange rate making eurozone goods more competitive overseas.

Orders from outside the eurozone surged 6.3% from May, while eurozone orders rose 2.3%. Domestic orders meanwhile fell 2.0%, a sign that external demand is increasingly driving economic activity here.

"Looking ahead, we continue to believe the German economy is on track to post above-potential GDP growth of 1.5% this year and next; however, should external demand remain firm, risks surrounding our forecast may be skewed to the upside," said Barclays economist Fabio Fois.

Germany's VDMA engineering federation, which represents over 3,000 midsize businesses, said last week that the U.S. has overtaken China as the biggest trading partner of German engineering firms.

But most economists doubt that German industrial production data, published Friday, will be as strong. Economists polled by The Wall Street Journal last week forecast a 0.4% monthly increase in industrial output in June.

-Hans Bentzien in Frankfurt contributed to this article.

Write to Nina Adam at nina.adam@wsj.com

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