The khareef season began on June 21.
National Centre for Statistics and Information said that 91,342 people visited in the first three weeks (June 21-July 10) compared to 56,423 in the same period last year, a 61.9 per cent rise.
Of the total number of visitors, 66.2 per cent were Omanis, 9.2 per cent Emiratis and 10.6 from GCC nations.
The Khareef Salalah 2018 Visitors Survey, which started on June 21 will continue till September 21.
The survey is being carried out for the 15th successive year, in cooperation with the Ministry of Tourism and ROP.