The New Zealand dollar weakened as an agreement between Greece and its creditors bolstered optimism that the US Federal Reserve remains on track to hike interest rates as early as September, spurring demand for the greenback.
The kiwi fell to 66.93 US cents at 8am in Wellington, from 67.31 cents at 5pm yesterday.
The trade-weighted index dropped to 70.91 from 71.05 yesterday.
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The US dollar index, which measures the greenback against a basket of currencies, jumped higher after an agreement between Greek and Eurozone leaders paved the way for a bailout.