The result dropped Northern to last in the competition, with Wellington ahead of them on run rate.
In Napier, Wellington captain Grant Elliott thought they were in with a sniff but rain again had the final word in their clash with Central Districts at Nelson Park.
The Firebirds were perched precariously on 205-8 after 46 overs with opener Michael Pollard unbeaten on 114 from 137 balls, including eight boundaries and No 10 Scott Kuggeleijn was 12 not out from 11 balls.
But the heavens opened and no further play was possible.
Pollard was the only batsman to show some fire in his belly as the Stags bowlers ripped through the visitors' batting line-up with monotonous regularity.
Canterbury and Otago's match in Rangiora was abandoned because of the weather.
Points after three rounds: Otago 11, Auckland 11, Canterbury 9, Central Districts 4, Wellington 2, Northern Districts 2.