Temperatures are set to drop sharply as tropical Cyclone Oma passes near the country at the beginning of next week.
WeatherWatch forecasters say it's looking "less likely" the cyclone will hit New Zealand directly, instead causing some unpredictable weather from Sunday.
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MetService appears to agree and has forecast temperatures that are up to 7degC lower during the day, and 9degC lower overnight next week.
Auckland is forecast to have a high of 27degC on Thursday, with an overnight temperature of 20degC.
But Monday should see a temperature of 20degC during the day and an overnight temperature of 11degC.
It's a similar story in places like Whangarei, Wellington and Christchurch.
Christchurch will be seeing the highest drop, going from an expected temperature of 31degC during the day, to 15degC on Monday.
NIWA has warned about "hazardous conditions" at the start of the week as temperatures drop significantly.
"Oma or not, a high impact weather system from the Southern Ocean will likely cause heavy rain, wind, much colder temperatures, and even some snow on Sunday-Monday!" NIWA warns.
"You'll definitely want to stay close for updates on the Sunday-Monday forecast. It could be hazardous. And you might just have to pull out the jumper."