Humidity levels are set to jump this week as the tropics bring rain and cloud to the North Island.
Weather Watch says the high pressure that has been over the country in the past week has shifted south, making way for the tropics to expand.
"Over the coming two weeks we see a number of large tropical storms and lows developing just to our north.
"This weather pattern shift starts today with easterlies in the north, more cloud and showers."
Weather Watch also says there is due to be a reversal in where the hottest areas are, as summer heat gets pushed into more western and southern parts of both islands.
"There will be some fairly warm humid nights ahead for the north and east too with overnight lows in the late teens."
Some areas of New Zealand are much drier than usual, including the upper North Island, the upper South Island, and some parts of the eastern South Island.
The humidity and rain should help certain parts of these regions. Northland is forecast to be hit with 100mm of rain in the next few weeks.