A cold start to the week will be balanced out with highs of 20C towards the week's end.
MetService meteorologist Tom Adams said temperatures will drop to zero degrees early this week, before a steady climb before the weekend.
"Hawke's Bay has had some pretty frosty mornings recently, with Napier likely to have frost across Sunday and Monday nights," he said.
"But there should be enough cloud over on Tuesday night to stop the frost as we go into Wednesday."
Hastings can expect lows of 1C on Monday night, with Napier hitting lows of 0C.