The euro rose broadly on Monday, driven by euro zone banks drawing back foreign-held assets before year-end and the European Central Bank chief's comment that there was no urgent need to cut rates.
The euro's strength this year has baffled many commentators and investors, who had expected tough economic conditions in some member states to weigh on the single currency.
However, it has been boosted by euro zone banks repatriating funds ahead of the year-end to shore up their capital bases before an ECB Asset Quality Review (AQR), and repaying cheap crisis loans to the ECB, which tightens liquidity.
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Also helping the currency were comments from ECB President Mario Draghi, who said in an interview with German news magazine Spiegel published on Saturday that he sees no urgent need to cut the euro zone's main interest rate further and no signs of deflation.
"The comments were supportive of the euro in otherwise eventless trading activity. Capital flows and elevated money market rates continue to support the euro as well,'' said Omer Esiner, chief market analyst at Commonwealth Foreign Exchange in Washington.
The euro was up 0.5 percent against the dollar at $1.3804, having shot up as high as $1.3894 in thin year-end trade on Friday, its highest since October 2011. It has risen more than 4 percent against the dollar in 2013 and is set for a second straight year of gains.
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The euro was 0.4 percent up against the yen at 145.03 yen, having hit a five-year high of 145.675 yen on Friday, with the Japanese currency weighed down by expectations the Bank of Japan will announce more money-printing.
Many commentators think the euro could weaken early in 2014 once the AQR is out of the way.
The euro was 0.8 percent down against the Swedish crown at 8.8842 crowns after November retail sales in Sweden rose more than expected.
The dollar hit 105.415 yen, its highest level since October 2008, in Asian trading but gave back gains to stand marginally down at 105.05 yen, down 0.1 percent on the day.
The yen has been the weakest major currency this year, weighed down by the BOJ's pledge to keep interest rates low.
The dollar has gained 21 percent against the Japanese currency while the euro, the strongest major currency in 2013, has risen 26 percent.