Data compiled by the Society of Motor Manufacturers and Traders show 5986 new cars were purchased in August, up from 5756 in August last year.
The UK as a whole experienced an increase of 11% in new car registrations with 65,937 units registered against 59,433 for August last year. In 2013, Scotland is more than 13% ahead of new car sales compared to this time in 2012.
Douglas Robertson, chief executive of the Scottish Motor Trade Association, said: "Once again we are happy to see the increase over 2012 continuing and once again we were strong in both the private and business sectors in August and we are satisfied that this shows a continuing increase in consumer and business confidence.
"Obviously we are a little disappointed that we have not kept up with the UK increases in August and this might be a reflection of the registration problems that many of our dealers are having with the DVLA in Swansea. However, we remain ahead of the UK in 2013 and are very pleased at that. We can, I think, look forward to a very busy 63-plate September."
The Ford Fiesta was the most popular new make and model of car purchased in Scotland last month, with 6947 new registrations. This was followed by the Vauxhall Corsa and the Ford Focus, with the BMW 1 Series creeping into tenth place with 1928 new cars sold compared to 1364 in August 2012. Fife saw the greatest year-on-year rise in registrations, up 18%.