It was a "warm and sticky" night across much of the North Island, with one region topping 18C.
Other parts of the country are forecast to reach up to 27C today.
According to MetService, the warmest place overnight was Ngawi in southern Wairarapa, with a high of 18.5C, followed by Mt Cook Airport at 17.7C and Whitianga at 17.5C.
Tauranga was 17C, while Auckland and New Plymouth were 16C.
A front is due to move up the South Island today, while a "feed of showers" is expected for the North Island.
Eastern parts of the country will see summer temperatures today, especially in Christchurch, where it was forecast to reach 27C.
Napier is likely to hit 26C, with temperatures in all other regions on the eastern coasts of both islands expected to be between 21C and 25C.
Rain will become more persistent tonight, with Christchurch getting hit after dark.
The ranges of Westland and Grey Districts north of Mount Cook is under a heavy rain watch from 9pm to 3pm tomorrow.
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