The euro reached a 2-1/2-year high versus the dollar on Friday, as a policy meeting by the European Central Bank gave bulls cause for short-term optimism and did little to support the beleaguered US currency.

Asked when the central bank will decide on potential policy tapering, ECB President Mario Draghi had said on Thursday the bulk of these decisions will probably be taken in October. That was enough to make euro bulls upbeat on the single currency's near-term outlook.

But Draghi also said the ECB must take into account the weakening of inflation owing to the strong euro, with the central bank having opted to lower some of its inflation projections to reflect a firming common currency.

Ultra-easy policy stance

Furthermore, the ECB reaffirmed its ultra-easy policy stance by retaining rates at record lows, even keeping the door open to increasing bond purchases if needed, despite the euro zone's best economic run since the global financial crisis.

“A large part of the euro's gains is being driven by expectations towards ECB tapering. The market did not get the confirmation it expected regarding tapering, but it remains far from disappointed,” said Bart Wakabayashi, branch manager for State Street Bank and Trust in Tokyo.

“If euro strength is to continue, this may actually prompt the ECB to refrain from tapering. But as demonstrated time and time again, the market tends to get ahead of itself.”

The euro was up 0.4 per cent at $1.2069 after touching $1.2090, its highest since January 2015. It has gained 1.7 per cent on the week.

Junichi Ishikawa, senior FX strategist at IG Securities in Tokyo, said the euro “was bought on mention of tapering possibly starting in October. But the ECB sounded rather dovish overall and the euro probably should have been sold in response, particularly with German bund yields having fallen.”

“But the euro still managed to gain, thanks to the dollar's underlying weakness,” he said. “The dollar is under pressure from many fronts ranging from sluggish inflation, Trump risk and geopolitical concerns.”

Against the yen and sterling, the euro's gains were more modest. It was a shade higher at 130.570 yen after rising 0.2 per cent overnight. The euro was up 0.25 per cent at 92.00 pence, putting it about 0.4 per cent stronger for the week.

Risk aversion takes hold

Compounding problems for the dollar, risk aversion took hold as the broader markets braced for North Korea celebrating its founding on Saturday, and as powerful Hurricane Irma headed for Florida after wreaking havoc in the Caribbean.

The dollar was down 0.2 per cent at 108.235 yen after dropping 0.7 per cent overnight when it briefly touched a 10-month low of 108.050. The Swiss franc gained 0.5 per cent to 0.9458 per dollar .

The dollar index against a basket of six major currencies was down 0.5 per cent at 91.210 after going as low as 91.082, its weakest since January 2015 and on track for a 1.8 per cent weekly loss.

Treasury yields slump

The US currency also felt pressure as long-dated Treasury yields fell to 10-month lows. US jobless claims data and worries about the impact of hurricanes Irma and Harvey on the world's largest economy stoked safe-haven demand for government debt.

US yields were further pressured by declines in German government bond yields after the ECB lowered its inflation forecast.

The Australian dollar rose to $0.8099, its highest since May 2015 and was last up 0.5 percent at $0.8096 against the broadly weaker dollar.

The New Zealand climbed 1.1 per cent to $0.7305, on the dollar weakness and a rise in the country's second quarter manufacturing sales as well as higher volumes for dairy and meat products

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