Australia, set an adjusted 235 to win from 33 overs, had stuttered to 53-3 before play was abandoned.
After the first rain delay, New Zealand came out firing with Australian worldwide Luke Ronchi particularly harsh on Pat Cummins' bowling, smashing two fours and a six from an over.
New Zealand captain and centurion Kane Williamson saw enough to be satisfied about after their opening match at the Champions Trophy against Australia was washed out.
A downpour right on the innings break, after the Aussies bowled New Zealand out for 291 in 45 overs thanks to a career-best haul of 6-52 from quick Josh Hazlewood, cost an hour of play and the reset score had Steve Smith's men on the immediate back foot.
Australia play Bangladesh on Monday, while New Zealand will take on England the following day. Ronchi had hit nine fours and three sixes when he departed in the 16th over.
However, the skipper was furious at the performance of his bowlers, as the returning Mitchell Starc (0-52) and Pat Cummins (1-67) in particular, struggled with the line and length albeit on a flawless batting wicket.More news: Is Overwatch Teasing A New Map Or A Potential New Hero?
More news: Solar Probe Plus: NASA to launch mission into Sun's atmosphere next year
More news: Russians believed they had 'derogatory' information on Trump
There is a bit of a hiccup, as two wickets tumble quickly, but Corey Anderson comes to the Black Caps' rescue, scoring a stirring half-century, which guides New Zealand to 318. If England defeat New Zealand, they will qualify for the Knockout phase. "Bangladesh is still a big game because they pushed England all the way to the end so we've got our work cut out to make sure we get that decider".
The match will be broadcast on PTV & Ten Sports in Pakistan, Channel 9, Fox Sports in Australia while SkySports and Sky Sports NZ in New Zealand.
Tom Latham and Luke Ronchi are both chasing the opening batting role and while they have both found some form in warm-up matches, neither has enjoyed success against Australia.
After beginning in typically aggressive style - upper-cutting a six off Tim Southee - David Warner was dismissed in the sixth over as he nicked through to Ronchi behind the stumps after charging down the pitch to Boult.
But he was then run out by Henriques's throw to Cummins.
"Jeetan Patel certainly has plenty of local knowledge and he says they produce the wickets the same way for County cricket and internationals, so he's certainly got some good insights for us".
It was in Birmingham four years ago where Australia's campaign at the last Champions Trophy foundered, on and off the field.