KEY POINTS:
Anyone sweating through stifling, muggy nights could be in for a reprieve, with cooler nights and warm, dry days forecast for this week. Weather Watch Centre head analyst Philip Duncan said high air pressure would bring warm weather to "most places, but especially the North Island.
"A nice big summer high moved in yesterday, kicking Friday and Saturday's storm into the Pacific and should last much of the week. Clear skies and lower humidity means sunny, hot days and slightly cooler nights - good news for those who can't sleep."
Weather conditions would become more unstable for the South Island near the end of the week. The Weather Watch Centre has also noticed a slight increase in unstable conditions north of New Zealand.
It says when the high finally leaves New Zealand, it could open the way for more showers and humid weather from the north.
Mr Duncan said it was nearing the cyclone season in the sub-tropics, when the seas are at their warmest.
