The New Zealand dollar fell after signs of life in the US economy sapped expectations for more monetary stimulus.
The New Zealand dollar fell to 80.65 US cents at 8am from 80.72 cents at the close of trading in New York on Friday and 80.91 from 5pm on Friday.
The kiwi decreased to 65.31 euro cents from 65.35 cents at the close of New York trading and 65.55 cents on Friday.
The trade weighted index declined to 72.89 from 72.99.
Upbeat consumer confidence on Friday added to the string of better-than-expected US data, which has eroded speculation the Federal Reserve will increase its monetary stimulus through a third round of quantitative easing (QE3).
"Any change in QE3 will be reflected in the kiwi/US cross," said Stuart Ive, currency strategist at HiFX.
"Data out of the US on Friday indicated that it may be turning to the positive side reducing the expectation of QE3."
The euro extended gains on optimism policymakers are closer to finding a solution for the debt crisis, even as German Finance Minister Wolfgang Schaeuble ruled out another aid programme for Greece.
"There is a definite Euro-wide decision to make to this thing succeed," Mr Ive said.
"They just have to decide on a line of thought."
The New Zealand dollar was little changed at 77.37 Australian cents from 77.33 cents at the close of trading in New York and at 64.19 yen from 64.12.
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