The New Zealand dollar fell after signs of weaker Chinese manufacturing activity weighed on commodity prices, denting demand for commodity currencies.
The kiwi slipped to 65.71 US cents at 8am in Wellington, from 65.76 cents at the New York close and 65.81 cents at 5pm on Friday. The trade-weighted index edged lower to 70.18 from 70.22.
Commodity currencies have been downbeat since the preliminary China Caixin purchasing managers' index weakened on Friday, raising concern that a slowing Chinese economy will reduce global demand for raw materials.
The CRB commodities index fell 0.9 per cent to a six-year low, driven by broad based falls that spanned grains, energy, soft commodities and iron ore.
Precious metals such as gold, silver and platinum bucked the trend, though West Texas Intermediate crude oil futures and Brent oil prices both declined.