The figure is slightly higher than the 0.5% the agency had previously estimated. The economy rose 1.7% in the fourth quarter from the same period in 2012, although it still fell 1.4% for the entire 2013.
Portugal hasn't recorded on-year quarterly growth since the fourth quarter of 2010. The turnaround surprised economists, who expected the euro-zone country to continue to be hard hit by the austerity measures the government imposed in exchange for a 78 billion euros ($108 billion) international bailout.
Signs of improvement, however, started showing late last year as the euro-zone crisis began to ease and companies pushed for sales in Portuguese-speaking Angola and Brazil and other growing markets outside Europe.The government expects gross domestic product to rise 1.2% this year.