The sunny weather comes courtesy of a ridge of high pressure edging its way north, strengthening northwesterly winds.
Wednesday will bring a "brief" change of weather, as front moves up the South Island, bringing rain to the West Coast of the South Island, Nickson said.
"The general pattern is settled weather but there's this brief weather system moving across the country pretty quickly mid-week which will bring some rain to western parts of the South Island and also the far South."
Auckland will see some cloud on Wednesday and a few showers on Thursday, with a slight dip in temperature down to 22C.
Wellington will have strong northerlies on Thursday, following mostly fine weather on Wednesday.
Christchurch won't see any of the rain forecast to hit the West Coast, with temperatures expected to be above 25C on Wednesday and Thursday.
In the South Pacific, the first cyclone of the season has already been upgraded to a Category two system, and is sitting north of Vanuatu as of the most recent update, Nickson said.
A belt of high pressure is expected to keep the cyclone north of New Zealand.
