Growth of 0.8% would be the strongest level recorded for three years and some experts think it could be nearer 1%, amid buoyant survey data from a number of sectors.
Investec's Philip Shaw forecasts 0.8% growth for the third quarter but said it was "not impossible" that this could be closer to 1%.
Analysts at Scotiabank predict a reading of close to 1% - lying somewhere between "spectacular" survey data suggesting growth of up to 1.5% and official figures pointing to expansion of as little as 0.5%.
Howard Archer, of IHS Global Insight, predicts GDP growth of 0.8%, the strongest since the second quarter of 2010, when a 1% improvement was recorded.
He said domestic demand may have risen by around 1% for the third quarter of 2013 but will have been tempered by disappointing net trade and industrial production figures.
Chancellor George Osborne told ITV News that the UK is on the "path to prosperity" but critics claim people aren't feeling the benefit.
The economy grew at its fastest pace for three years but the big question is can it be sustained?