Torrential rains from Gita, which was downgraded on Tuesday from a tropical cyclone to storm, lashed the centre of New Zealand, causing floods in the city of Christchurch and other provinces.
Heavy rain caused landslips, closing arterial roads, including a state highway.
New Zealand's weather bureau told local media the worst was likely over.
"Really the heavy rain now is focused from Canterbury down to Otago this morning, then that gradually eases," MetService meteorologist Karl Loots told the Dominion Post.
"The worst impacts for most have past."
In New Zealand's South Island, about 200 tourists were still trapped after spending the night in their buses or in welfare centres, Radio NZ reported.
Schools in Canterbury remained shut on Wednesday and around 14,000 households in the central North Island remained without power.
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