"The temperatures reflect this change at the end of the week with the highs dropping from 17C and 18C to 15C and 14C."
The overnight lows will also drop from 7C to about 4C heading into the weekend.
"We won't be expecting any frost over the next few days but after the next southerly blast there might be some about."
This will be a disappointment to people travelling to the Bay for Queen's Birthday this weekend but Mr Bellam said there was still hope that the weather could change.
"The weekend is still a while away but at the moment it is looking pretty cold."
Meanwhile Hawke's Bay Federated Farmers president Will Foley said farmers were still coming off the back of the best autumn in a while, which has put them in a relatively good position heading into winter.
"We have had more rain than any other autumn in a while, which has set farmers up pretty well going into the next few months."
However he said the large amount of rain we had been experiencing had "upset the apple cart".
"It is wet underfoot so I think farmers will be deciding what stock to head into winter with and rejigging some stock policies."
He said most farmers would be looking to offload cattle now, which had caused cattle prices to drop.
"In saying that, in comparison to other parts of the country Hawke's Bay has been quite lucky even though the conditions were wetter than normal. Places like Manawatu and Bay of Plenty are very wet underfoot and still feeling the effects from the storms last month."