The NI Composite Economic Index (NICEI) showed growth of 0.3% when compared to the first quarter of the year.
Compared to the same period in 2013 the economy has grown by 1.2%
The growth is being driven by the services and manufacturing industries while construction output is still falling.
Meanwhile, the labour market is continuing to improve with the number of people claiming jobseekers allowance down again in September.
The number of claimants was down by 300 to 52,000 - over the last year the number has fallen by  9,400.
The quarterly unemployment rate also showed a fall - it was down by  0.5 percentage points for the period June to August 2014 bringing it to 6.1%.
That is the lowest quarterly rate since December to February 2009.
Enterprise Minister Arlene Foster described the economic data as "encouraging".
She said the number of unemployment claimants had now been falling for 21 months, the most sustained decrease since June 1995.
She said the NICEI  "also shows evidence of growth in real terms over both the quarter and the year up to quarter two".

Lord Alderdice said proposals for a new international body to monitor paramilitary activity would have "much less power" than the panel he sat on.
He was a member of the Independent Monitoring Commission (IMC) which operated from 2004 to 2011.
The Liberal Democrat peer said the new body would only be able to produce a few proposals for the Executive.
"Which will then fall into disagreement about how they should be implemented," he said.
Lord Alderdice spoke on Tuesday's debate on the Northern Ireland Welfare Reform Bill in the House of Lords.
The former Church of Ireland primate Archbishop Robin Eames also used the debate to express his disappointment that the "Fresh Start" deal did not include any agreement on the legacy of the troubles.
Lord Eames, who was co-chair of a consultative group on the past, told peers he was well aware of the "desperate plight" of troubles' victims.
He urged the government to publish the legacy papers prepared during the inter-party negotiations, arguing that the victims "deserve nothing less".
Lord Eames expressed the hope that legacy issues might yet be tackled, adding that "perhaps the situation is not as bleak as it seems".
The government spokesman, Lord Dunlop, said the establishment of a new monitoring body to assess the impact of paramilitary activity on local communities is "a crucial part" of the "Fresh Start" deal.
Lord Dunlop said the government regretted the fact that an agreement on legacy issues could not be reached, and remained committed to continuing to work to build a consensus.

The 23-year-old midfielder is his country's joint all-time goalscorer, with two goals from 11 caps.
He ended last season on loan at Forest Green and is the second Gibraltar international to represent Torquay, after goalkeeper Jamie Robba.
"He is a very talented player who has experienced a bit of a plateau in his career," said boss Kevin Nicholson.
"It is those kinds of players that thrive in our environment and if we can get the best out of him, then we will be in a good place and so will he."
Find all the latest football transfers on our dedicated page.
Northern Ireland's economy grew slightly in the second quarter of this year, according to the latest official figures.
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The former leader of the Alliance party Lord Alderdice has criticised plans contained in the "Fresh Start" deal.
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Torquay United have signed Gibraltar international Jake Gosling following his release by Bristol Rovers.