Dismal business activity data from the euro area, especially powerhouse economy Germany, has pushed European bond yields lower across the board this week, with further pressure coming from concern over economic weakness in Britain.

"We have had a steady drip of weak data from the euro zone this week and that is highlighting the differences between the U.S. and Europe," said Commerzbank analyst Thu Lan Nguyen, adding that the United States is still showing signs of strength.

Negative interest rates, quantitative easing and other attempts by the European Central Bank (ECB) to stimulate the euro zone economy are also making investment in U.S. government debt more attractive and boosting the greenback against the euro.

“The more recent drift lower in the euro seems to be perpetuated by the continued grind lower in growth expectations, and certainly in realized growth in the euro zone," said Mazen Issa, senior FX strategist at TD Securities in New York.

Further ECB stimulus, negative rates and bond buying are also exerting a pull on the euro, he added.

The euro dropped as low as $1.0903, its lowest since May 2017, in overnight trading before rising back to $1.0938.

The single currency has technical support around $1.0925, which could provide a floor for the time being.

“We did break below that briefly yesterday, but that was late trading in New York, and so I think there is going to be quite a bit of hesitance to try to push it below that on a sustainable basis,” Issa said, noting that quarter-end rebalancing is also limiting risk taking.

Sterling  also fell weakened to a two-week low of $1.2269 after Bank of England policymaker Michael Saunders hinted at looser monetary policy if Brexit uncertainty remained prolonged against a backdrop of disappointing global growth.

The currency later rose back to $1.2291.

The Chinese yuan weakened after Bloomberg reported that White House officials are discussing ways to limit U.S. portfolio flows into China.

The greenback gained %0.31 on the day to 7.1451 yuan.

(Additional reporting by Saikat Chatterjee in London; Editing by David Goodman and Marguerita Choy)

By Karen Brettell