The New Zealand dollar gained as traders pare back bets for the Federal Reserve to hike interest rates next month following the release of minutes to its last meeting, amid turmoil in global markets.
The kiwi rose to 66.29 US cents at 8am in Wellington, from 66.12 cents at 5pm yesterday.
The trade-weighted index advanced to 71.30 from 71.14 yesterday.
Traders sought the safety of assets such as gold overnight as Chinese equities dropped 3.4 per cent on the Shanghai Composite Index, Kazakhstan abandoned its fixed-exchange rate regime causing its currency to slump, Turkey's lira fell to a record low as the country's security situation deteriorated ahead of this year's election and North and South Korea exchanged artillery fire in the most serious exchange since 2010.
The US dollar index, which measures the greenback against a basket of currencies, fell to a six-week low as traders pushed out expectations for interest rate hikes.