Spain welcomed 9,070,024 visitors in August, the first time the 9,000,000-mark has been passed.
The figure also means the country received 8.8 percent more visitors last month than a year earlier, Spain's national broadcaster TVE reported on Monday.
The UK remained the main source of Spain's visitors with 2,136,879 Brits making the trip south, a rise of over 5 percent on a year earlier.
There was also a 9.4 percent surge in the number of French people travelling to Spain, with 1,981,643 people from France visiting their southern neighbour.
Overall visitor numbers for the first eight months of 2014 were up 7.3 percent on the same period a year earlier, with 45,384,483 foreigners coming to Spain.
Spain's ongoing tourism boom has not been without its dark side however.
August saw protests in the Barcelona neighbourhood of La Barceloneta against illegal holiday apartment and drunk tourists.
Meanwhile, authorities in Majorca cracked down on tour companies and clubs and bars in the wake of a sex-for-drinks scandal in the island's resort area of Magaluf.