It will stay warm on Tuesday, with highs of around 19-20C, but rain is also predicted, which could be heavy inland near the ranges.
"It will ease off over night, and then Wednesday becomes fine again," James said.
"Then there is another southwest change which comes through on Thursday, which will bring a few showers.
"And then mainly fine again in Friday, so not too bad a week."
Temperatures will drop from Tuesday, the high on Wednesday is expected to be 18C and cooler again on Thursday with 14C.
Friday will be slightly warmer again, with a high of 17C predicted.
James said other parts of the country would be experiencing frosty overnight temperatures, including negatives overnight in the South Island.
However he said this would not affect Hawke's Bay to the same extent.
"Not quite as cold, being moderated by the sea, there on the coast."
He said it could be a bit windy ahead of the front landing on Tuesday, and there was a low probability these would reach gale force.