The NZD traded at 82.70 Australian cents at 5pm in Wellington from 82.65c yesterday, having climbed as high as 82.85c.
The March trade surplus almost twice the $373m forecast.
"So how does that work when Russel Norman tells us our dollar is so overvalued he wants the govt to intervene?"
Shipments of milk powder, butter and cheese dropped by 16% to $1.1 billion.
China picked up the slack, with September exports rising 23% to $468 million and imports edging up 1.1% to $718 million.
Small trade surplus after shipments of dairy products to China make up for weaker exports to Australia, Indonesia and India.
"Trade surplus in a wintery month is a good sign of better times to come."
October's trade balance was a deficit of $282 million taking the annual trade balance to a surplus of $627 million.
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