Both Napier and Hastings would see temperatures climb to 24C, with overnight temperatures in the mid teens.
The warm, sunny weather will stay through into Sunday, with possible patchy cloud in the morning, and fine in the afternoon.
"It might cloud up a little bit in the evening."
It will stay warm on Monday, with the summer weather really kicking in on Tuesday, with temperatures sky rocketing to 27C in Napier and 29C in Hastings.
He said much of the North Island would be experiencing similar weather as Hawke's Bay.
"You'll see all those showers building up inland, and fine breaks for coastal parts."
The South Island will see the weather settling down today , with dry, fine weather expected.
As for Christmas, Kerr said it was hard to tell what the weather will be yet.
He said while long range models were beginning to extend to Christmas Day, cyclone activity of the coast of Australia was causing uncertainty.
He said it is not yet certain what direction Cyclone Owen will head, and as New Zealand is "downstream" from Australia, it made it difficult to predict the long range weather.
"At the moment there is so much variation that any forecast is a stab in the dark."
He said they should have a clearer picture of the Christmas weather in the next couple of days.
