Khan said his side had been playing well before arriving in New Zealand but was struggling to adjust to the conditions, particularly the extra bounce, which he said you did not tend to get on the subcontinent.
Zimbabwe's record for the lowest ever ODI score - 35 v Sri Lanka in 2004 - was under serious threat when Colin Munro bowled Shadab Khan to leave the visitors 16-6 within 15 overs, as was Pakistan's lowest score of 43 (against the West Indies in 1993).
The Duckworth-Lewis-Stern calculation left the Black Caps chasing an adjusted total of 151 from 25 overs and the home side overhauled the target with more than an over to spare and eight wickets in hand.
The duo continued to punish the the Pakistan bowlers with Guptill reaching his fifty with a six.
Right-arm speedster Trent Alexander Boult produced an outstanding effort of consistently fast bowling to lead the New Zealand to a 183-run victory over Pakistan in the third and final match for 3-0 clean sweep of the series on Saturday.
New Zealand's winning margin also eclipsed their previous biggest victory over Pakistan, which had been 138 runs at Christchurch in 2001.
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The first match in Wellington, which New Zealand won by 61 runs, was also affected by the weather and further rain is forecast for game three in Dunedin on Saturday.If a result is achieved, a win would not only give them New Zealand the series but they would also equal their longest streak across all formats of 10 wins.
Veterans Azhar Ali and Mohammad Hafeez and the young Shadab Khan were all bowled out on duck.
Opener Fakhar Zaman returns to the Pakistan lineup after missing the second match with a bruised thigh.
Hafeez tried to play a steadying role with his 33rd half-century in ODIs but Pakistan weren't able to build partnerships at the top of the order.
He combined with Hasan Ali (51 off 31) to help the tourists post 246 for nine. Trent Boult took five for 17.
Shoaib Malik (3) was caught at first slip off a 147.5km/h Lockie Ferguson delivery.