The Steve Jackson-coached side is currently in 16th place behind Tonga who is currently in 15th.
Samoa recorded its best position back in 2013 when they were ranked 7th before dropping to 17th from last year.
The ‘Ikale Tahi’ Tongan rugby side on the other hand, recorded its best position back in 2011 finishing in top ten and placing in ninth place.
Fiji has currently dropped from eighth to tenth place in the rankings.
The Rugby World Cup will be held from 20 September to 2 November in Japan.