But for Manawatu it brings an end to a disappointing season in which they only managed three wins from their 10 games.
Conditions dictated the early phases of the game, where the slippery ball meant both sides tried to keep it close and reduce handling errors.
Despite the slips and slides, both sides were visibly up for the match and there was passion and determination in abundance at every breakdown and in every tackle.
Perhaps the best example of the desire to win was shown by Southland's Jamie Mackintosh who changed his mind 10 minutes before kick-off about playing through a rib-cartilage injury.
He led by example and played a role in Southland's opening try of the match when Cardiff Vaega gave the home side a 5-3 lead after 22 minutes.
Manawatu have conceded the most points in this year's competition but they also boast a pretty slick attack and the question was when, not if, they would break down the Southland defence.
Ma'afu Fia answered the call in the 28th minute driving over from close range after a period of dominance from the visitors.
The second half was one for the purists. The brave few that weathered the inclement weather watched 39 minutes of scoreless second half action before Mckenzie won the match with the last play of the game.
Southland 17 (C Vaeaga try, M McKenzie; S Eade 2 con; 1 pen) Manawatu 11 (M Fia try; N George pen; L Marshall pen) Halftime 7-8
-nzherald.co.nz