The upward revision is a positive sign for growth in the current quarter, but there are concerns that the impact of the UK's decision to leave the European Union could send shockwaves through the US economy, slowing growth in the autumn.
Economists currently expect second quarter growth in 2016 to be close to 2.4%
Nariman Behravesh chief economist at IHS, said: "Consumers will resume their role as the powerhouse of the US economy, with personal consumption expenditures in the second quarter estimated to grow by 3.7%."