The New Zealand dollar jumped higher after the minutes of the Federal Reserve's last meeting pushed out expectations for a US interest rate hike, damping demand for the greenback.
The kiwi rose to 66.08 US cents at 8am in Wellington, from 65.79 cents at 5pm yesterday.
The trade-weighted index increased to 71.06 from 70.95 yesterday.
The US dollar index, which measures the greenback against a basket of currencies, dropped after the release of the minutes, which cited concerns about weak wage inflation and oil prices.
Futures show traders pared back their expectations the Fed will raise rates at its September meeting to about a 38 percent chance, down from about 50 per cent earlier in the day, according to Bloomberg.