The July figures from IMRG Capgemini e-Retail Sales Index also show a 16.8 per cent rise compared to July 2008.
The report suggested that in the last six months consumers have been encouraged by new summer lines and heavy discounting and promotions.
Fashion was one of the driving factors in the rise and online sales of electrical items also rose 11 per cent from June, with twice as many men shopping online compared to women.
Cameron McLean, of online payment service PayPal, said: "Men love the quick and efficient nature of the internet, especially when it comes to buying technology and gadgets.
"Men are also spending more online than women. The average online spend over the last six months was £2,602 for men compared to £1,930 for women.
"Men, in fact, spent more than women in every category except groceries and clothing, suggesting that the female pound is still responsible for the growth in online sales of clothing, accessories and footwear year on year."