The British Retail Consortium research shows:
- The most notable impact from the Olympics was felt online, which saw growth of 4.8% in August, the lowest since the BRC started collecting data on internet sales in October 2008.
- Warmer weather in the middle of August helped boost sales of food, especially party snacks such as crisps, nuts and barbecue foods.
- Clothing had an "unusual and rather disappointing" month, the BRC said, as womenswear retailers failed to attract customers to autumn/winter ranges.
More top news
The Westminster terror attack dominates the front pages of Thursday's newspapers.
A timeline of exactly what happened.
Tobias Ellwood, MP for Bournemouth East and Foreign Office Minister, attempted to save the life of the stabbed officer in Westminster.