"The exit polls were completely incorrect on the British elections and quite clearly useless on Brexit.
The market got completely wrong-sided," said Tim Kelleher, head of institutional FX sales at ASB Bank. "Across the board, there's risk off".
Kelleher said there's a high probability of intervention in currency markets by central banks, possibly acting in concert. "I don't think the Bank of England has been in yet."
The vote also "puts any chance of a Fed rate hike on the back foot and absolutely puts an August cut by the RBNZ on the cards," he said. New Zealand's financial markets have been relatively unscathed in the fallout from the Brexit.
The South African rand and Japan's Nikkei 225 Index tumbled more than 7 percent, while New Zealand's S&P/NZX 50 Index has fallen 2.3 percent.
Gold and the yen, typically seen as safe haven investments, both climbed.
"We've come out of it relatively unscathed," Kelleher said.
"We're as far as you can possibly get from all the carnage and we have reasonably attractive yields."
New Zealand's two-year swap rate dropped 14 basis points to 2.17 percent and the 10-year swaps tumbled 21 basis points to 2.65.
The trade-weighted index was recently at 75.36, having earlier soared to 76.90, from 75.99 yesterday. The kiwi rose to 63.88 euro cents from 63.41 cents and slumped to 71.06 yen from 75.12 yen yesterday.
The local currency dropped to 4.6286 yuan from 4.7222 yuan and rose to 95.53 Australian cents from 95.45 cents yesterday.