The New Zealand dollar rose above 67 US cents as traders delayed their expectations for US interest rate hikes, broadly weakening the greenback.
The kiwi touched 67.07 US cents late on Friday in New York and was trading at 66.53 cents at 8am in Wellington, from 66.82 cents at the New York close, and 66.24 cents in Wellington at the end of last week.
The trade-weighted index rose to 71.63 from 71.32 on Friday.
The US dollar index, which measures the greenback against a basket of currencies, touched its lowest level in almost two months after traders pushed out their expectations for US interest rate hikes on last week's softer-than-expected minutes to the Federal Reserve's July meeting.
Global sharemarkets weakened amid concern about the impact of slowing growth in China.