The figure has increased from around 50% in April thanks to the number of people signing-up to broadband internet services, market analysts Mintel said.
The company predict that 67% of UK adults will be online within two years - up from 57% now.
However, it believes saturation point will come when 75% of adults can access the net at home, work or other venue such as an internet cafe.
Neil Mason, retail analyst at Mintel, said: "It would appear that much of this sudden growth in internet penetration levels is being driven by a rapid expansion in the numbers of broadband internet users in response to a stepping up of the marketing efforts by the various broadband service providers."
The report is based on a survey of 4,000 adults in Britain carried out by Mintel and Mori.
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