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.