MetService has issued a severe weather warning, with much of the country expected to face strong winds and heavy rain on Thursday.
The wild weather is forecast to hit most regions of the North Island, from Northland down to Horowhenua, and the South Island's West Coast.
Auckland's Civil Defence is warning Aucklanders to be prepared.
Auckland Council's head of emergency operations, Aaron Davis, says this comes on top of more than a week of rainy weather which has left the region saturated and vulnerable to slips.
"With soils already fully saturated there is chance of localised flooding and slips. Predicted strong wind gusts may cause structural damage, including affecting trees and power lines. In anticipation of further wet weather, it pays ensure drains are clear and property that might be affected by storm damage is secure," he says.
"If out and about tomorrow, please drive to the conditions and take care on the roads, especially in slip prone areas. Added to all of this there is a low risk of small tornados. If you see a tornado or funnel forming, take shelter immediately and help alert others."
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