"On Sunday, a few brief showers, partly cloudy," Best said.
Despite the rain and cloud, the wind is still coming from the north-west, meaning it will stay warm, with temperatures climbing to 20C.
Best says Monday will bring a cool, southerly change with it, bringing the temperature down to a high of 16C, and it will continue to drop as we head into Tuesday, with a high of 13C.
"It'll feel colder again on Tuesday," Best said.
Hawke's Bay is in good company, however, as the southerly change will bring cooler temperatures and rain to much of the country.
In the South Island, the southerly blast could bring snow down to 300m, which may make driving on the alpine passes hazardous.
Unlike the South Island, Hawke's Bay will not have to contend with snow, but Best said to be aware of frosts, as they can form with overnight temperatures as cool as 2 or 3C.
So make the most of the sunshine today, because for the rest of the week it's looking more like winter than spring.