The New Zealand dollar fell as investors await more evidence of the pace of global growth, including Chinese manufacturing and US consumer confidence and durable goods orders.
The kiwi fell to US81.60c at 5pm from US81.65c at 8am and US81.88c at the close of New York trading on Friday. The trade-weighted index decreased to 72.72 from 72.88.
Chinese manufacturing figures this week are expected to show declining activity in the world's second-biggest economy, after the HSBC Flash PMI, a lead indicator of factory activity, raised expectations of a harder than expected landing.
The Dollar Index, a measure of the greenback against a basket of currencies, fell 0.5 per cent to 79.36 on Friday in New York after US home sales fell in February.
That sparked fears the US recovery may not be as embedded as previously thought after a string of upbeat data prompted traders to start betting on an earlier Federal Reserve rate hike than the end of 2014.