In thin holiday trade the greenback had edged 0.2% higher against a basket of currencies and rose by roughly the same margin against the euro to $1.1816.
The dollar is set for its biggest weekly rise since June, boosted by a wave of risk aversion in markets after Wall Street pulled back from recent tech-led gains.
The euro and the pound are both down about half a percent versus the dollar this week - the pound's biggest weekly fall since mid June.