Until Thursday the weather is expected to be fine with light northwesterlies, with temperatures dipping to lows between 14C and 11C.
A westerly flow will cloud skies later in the week as fronts begin moving over the country, Ms Clark said, leading to some high cloud developing late on Thursday.
But this will not stick around for long, with cloud clearing and becoming fine on Friday. Some light winds will cool down the day's high of 24C.
Rain may appear on the horizon at the weekend as some stronger fronts begin to move up toward the North Island, but these are expected to have weakened by the time they reach the East Coast.
Both Saturday and Sunday are expected to be partly cloudy with not much wind. Sunday will return to more autumnal temperatures, with a high of 19C.