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A southerly change is set to hit the country over the weekend which could drop temperatures by nearly 10C in some centres, compared to last weekend.
However, the cooler temperatures won't necessarily bring wet weather, WeatherWatch.co.nz analyst Philip Duncan said.
"A cooler southerly flow is spreading across the country, so compared to last weekend, it's going to feel a few, to several degrees, cooler."
Auckland was predicted to reach highs of about 18C, down about 4C from last weekend, Mr Duncan said.
"In the wind it will feel even colder than that."
Dunedin and Christchurch residents should feel more of a bite, with temperatures dropping from about 20C to about 12C.
The temperature would also drop in Wellington, with the high reaching just 13C, down from the high teens a week ago, Mr Duncan said.
"It's a shock to the system compared to last weekend."
While the weekend was expected to be cold, it should still stay mostly dry, he said.
"There'll be a few showers around Auckland and Northland on Saturday, but most of the main centres look fairly dry this weekend.
"For those in sunny, sheltered, places this weekend conditions will still be mild - but expect colder to cooler nights right across the country."
- Rebecca Quilliam of APNZ