The data will be reported to the Cabinet at tomorrow's meeting.
The top 10 tourist sources were China, Malaysia, Russia, Japan, South Korea, India, Britain, Laos, Australia and Germany.
In July alone, Thailand welcomed 2.2 million tourists, up by 22.47 per cent from the same period last year.
Among top outbound destinations are countries in East Asia. The ministry said that the number tends to rise significantly.