A southerly front is moving up the country - bringing cooler temperatures and forecasts of heavy rain.
Christchurch reached 29 degrees on Sunday, but the temperature has dropped to 13C on Monday.
Kaikoura hit 25C and is in for 13C on Monday as well.
Heavy rain and thunderstorms are expected for parts of the upper north island Monday afternoon.
The Bay of Plenty, Coromandel and eastern parts of Northland could be hit with the downpours.
MetService meteorologist John Law spoke to Ingrid Hipkiss.