The New Zealand dollar extended its decline in local trading as weaker commodity prices weighed on currencies linked to the production and export of raw materials.
The kiwi fell to 63.06 US cents at 5pm in Wellington from 63.32 cents at 8.30am, and down from 63.99 cents yesterday.
The trade-weighted index declined to 68.97 from 69.79 yesterday.
Stocks across Asia followed Wall Street lower on persistent fears over China's economic growth, and while traders continue to second-guess when the Federal Reserve will start raising interest rates.
The heightened volatility weighed on commodity prices, with the Thompson Reuters Core Commodity CRB Index, a measure of 19 commodity prices, falling 1.5 percent yesterday, and demand for currencies such as the kiwi and Australian dollars, whose economies rely on the exports such as iron ore, coal, dairy products and meat.