The New Zealand dollar declined after US labour market data left open the possibility of US interest rate hikes this month.
The kiwi fell to 62.89 US cents at 8am in Wellington, from 62.77 cents at the New York close and 63.61 cents at 5pm on Friday. The trade-weighted index slipped to 68.75 from 69.27 on Friday.
Traders are split on whether the Federal Reserve will raise interest rates for the first time since 2006 at its Sept. 16-17 meeting amid concern about global growth.
US employment data published on Friday showed the world's largest economy added 173,000 jobs in August, lagging behind expectations for 217,000, although economists speculated the data may later be revised higher in line with previous years.
Data for the previous two months was revised up, average hourly earnings increased more than expected and the unemployment rate dropped to 5.1 per cent, which is in line with the Fed's view of the long-run equilibrium rate.