The weather would briefly improve on Wednesday before turning southerly on Thursday.
However, Thursday will also see the warmest temperatures for the week before starting to cool, with Napier and Hastings expected to sit around 28C.
"It will feel a bit colder as we head into Christmas.
"There will be a few showers in that southerly."
Adams said temperatures on Christmas day would sit around 24C in Napier and Hastings.
"There is an improving trend when we actually get to Christmas."
While Christmas Day would be cloudy, he said most of the North Island would be spared from a trough coming through later in the weekend that would bring wet weather.
It would still be important for people heading out on to the roads next weekend to check for updates and look out for any severe weather warnings, he said.