The Sun, amongst five UK national newspapers to report ABCE figures on monthly web traffic, attracted 10,594,198 unique users last month.
Its previous record traffic level of 9,543,772 was achieved in January.
August's monthly figure is an increase of just under 37 per cent from August 2006, and a month-on-month increase of over 12 per cent.
It also received a record number of page views - 238,917,574 - more than any other UK national newspaper reporting monthly traffic figures for August.
The Telegraph also saw a month-on-month increase of nearly nine per cent - from 8,992,526 users in July to 9,770,562 in August. Year-on-year its unique users had grown over 64 per cent.
The Guardian recorded a month-on-month fall in unique users. Falling from 16,058,979, in July, to 15,821,480 in August - a drop of 1.5 per cent.
It did, however, record year-on-year growth of 26 per cent and it remains the UK national newspaper website receiving the most monthly unique users, according to the ABCE metric.
The combined websites of the Daily and Sunday Mail remained as the nationals receiving the second most unique users, after posting 11,585,134 in August, a slight fall - just over two per cent - from 11,865,039 the previous month.
The Sun remains in third place, the Times fourth and the Telegraph fifth.
The trend of a slight downturn in users during the height of the UK summer was replicated by the Times Online, which recorded a fall of three per cent to 10,239,223 unique users, month-on-month. Yet, it recorded a 15 per cent rise from August 2006.
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