A heatwave is expected to hit Napier from today, with daytime and overnight highs sitting well above average.
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MetService is forecasting five days of persistent heat, which could meet its heatwave criteria.
MetService meteorologist Lewis Ferris said Napier's high today was forecast to be 27 degrees, and on Sunday it is predicted to get to up to 29C.
And he said the overnight temperatures were also expected to be hot, forecast to only drop to 22C on Saturday night - that was 12C above average.
Ferris said the public needed to be careful because those heatwaves could be dangerous for people, livestock and pets.
Napier recorded its hottest October day in more than 20 years at a high of nearly 28C.
North and South
MetService Meteorologist April Clark said to expect more spring-like, changeable conditions for Aotearoa
"The north to northwest flow ahead of this weather system brings warm, humid air, from as far north as northern Queensland, to New Zealand over the next few days."
This subtropical air could mean heavy bouts of rain over western coasts, and warmer temperatures.
Clark said North Island is forecast to see warm days and muggy nights the entire weekend for.
In the South, a brief hot spell can be expected along with bouts of rain throughout the weekend also for the West Coast.