The U.S. dollar traded mixed to higher against the most major currencies after comments by Federal Reserve Chair Janet Yellen in Jackson Hole. Janet Yellen said that the U.S. labour market is not yet fully recovered. But she added that the U.S. labour market was improving. The Fed Chair Yellen offered no signal when the Fed will start to raise its interest rate.

Investors speculate that the Fed may hike its interest rate sooner than expected.

Tensions over Ukraine also weighed on markets. Ukraine said Russian humanitarian aid trucks crossed the Ukrainian border without being accompanied by the Red Cross.

The euro declined against the U.S. dollar in the absence of any major economic reports in the Eurozone.

The European Central Bank President Mario Draghi will speak in Jackson Hole later in the day.

The British pound traded mixed against the U.S. dollar in the absence of any major economic reports in the UK.

The Canadian dollar traded mixed against the U.S. dollar after the mixed Canadian economic data. Retail sales in Canada climbed 1.1% in June, exceeding expectations for a 0.6% rise, after a 0.9% increase in May. May's figure was revised up from a 0.7% gain. That was the sixth straight increase in six months.

Retail sales excluding automobiles rose 1.5% in June, beating forecast of a 0.6% gain, after a 0.3% increase in May. May's figure was revised up from a 0.1% rise.

The consumer price index in Canada climbed 2.1% in July, after a 2.4% rise in June.

On a monthly basis, the consumer price inflation in Canada declined 0.2% in July, missing expectations for a 0.1% fall, after a 0.1% increase in June.

Canadian core consumer inflation (excluding eight volatile products) rose 1.7% in July, after a 1.8% rise in June.

On a monthly basis, Canadian core consumer inflation fell 0.1% in July, after a 0.1% decline in June. Analysts had expected the core consumer inflation to be flat.

The New Zealand dollar traded lower against the U.S dollar in the absence of any major reports in New Zealand.

The Australian dollar traded lower against the U.S. dollar in the absence of any major reports in Australia.

The Japanese yen traded lower against the U.S. dollar in the absence of any major reports in Japan.