"You'll start to see some rain by Friday which might be good for the farmers, but not so good for those who want to relax in the sunshine.
"The weekend isn't looking much better with some heavy falls predicted and north-easterly winds."
Hawke's Bay would experience high cloud today with some scattered showers around Wairoa, but they would slowly ease off as the day progressed.
Despite a mixed bag of weather for the rest of the week, Marintchenko said the temperatures were climbing high for the middle of winter.
"Today Napier will reach a high of 15C, but on Wednesday it'll probably get to about 18 or 19C - so that's pretty nice.
"You'll be getting westerly winds again on Tuesday and Wednesday, so you're getting warm dry air for two days."
However the northeasterly winds at the weekend were predicted to whisk away the warm temperatures, leaving the region to deal with highs of 8C and 9C for Saturday and Sunday.
Hawke's Bay's varied weather patterns were down to an Enso-neutral phase - a period often coinciding with the transition between El Niño and La Niña events, according to Niwa.
Meteorologist Ben Noll said the winter weather extremely variable and would continue into the month of August.
"If the wind blows from the west - that means that it comes from offshore and it's generally a warm wind direction which means a continuation in that warmer weather that you've seen so far," he said.