The New Zealand dollar gained in volatile trading over the weekend as investors weighed the likelihood of an interest rate hike in the US next month following labour market data on Friday.
The kiwi rose as high as 66.36 US cents, and was trading at 66.03 cents at 8am in Wellington from 66.16 cents at the New York close and 65.54 cents on Friday.
The trade-weighted index jumped to 70.41 from 69.99 on Friday.
The US dollar index, which measures the greenback against a basket of currencies, declined after touching its highest level in almost four months as investors considered whether the US Federal Reserve will raise interest rates next month following solid jobs data that just undershot expectations.
The labour report, released Friday in the US, showed the world's largest economy added 215,000 jobs in July, just missing expectations for a 225,000 gain.