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The next two nights are forecast to be uncomfortably hot and humid on the North Island and upper South Island, while heavy rains are expected for parts of the lower North Island through Wednesday.
Upper-level jet stream winds blow from eastern Australia into New Zealand and provide some hot, humid, wet and muggy conditions, says MetService meteorologist Angus Hines.
MetService warns that heavy rains over Mount Taranaki and the Tararua Range could linger until noon Wednesday, while for Horowhenua and Kāpiti Coast it will likely subside early Wednesday.
Abigail Dougherty / Stuff
Aucklanders photographed in Mission Bay as the sun rises. (File photo)
There is also the possibility of heavy rain in Wellington, especially in the north of the city, until the early hours of Tuesday.
For western Nelson and Buller, rain could be heavy until early Wednesday, while the mountainous region from Taranaki to the central plateau could experience heavy rain through Tuesday evening.
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MetService forecaster Tahlia Crabtree said that some watersheds in the Tararua Range could collect up to 350mm of rain, which means rivers could swell and flooding is possible on roads.
Elsewhere, parts of the country could hit 30 degrees in the next few days, although forecasts on Monday afternoon called for a high of 29 ° C.
MetService
Current severe weather advisories and alerts are good through Wednesday, but more rain is coming up the South Island to end the week.
On Monday, Christchurch appeared to be in the best position for the warmest temperature in the country and by late afternoon it reached 30 ° C, with Hastings slightly cooler at 28.4 ° C.
This heat is due in part to the northwesterly foehn winds, with the air warming and drying out as it crosses the mountains and high ranges on its way to the east of the country.
When the Northwest reached Christchurch on Monday morning, it raised the temperature by about 4 ° C in an hour, Crabtree said.
MetService forecast a maximum of 28 ° C on Monday for Whangārei. At 3 pm, the temperature was 26.2 ° C. The daily maximum in the area is normally 22 ° C or 23 ° C in December.
“It’s quite hot there, but because of all the high clouds currently in there, that’s cushioning the impact of the sun as temperatures rise,” Crabtree said Monday afternoon.
Whangārei, Hastings and Napier are forecast to hit 29 ° C on Tuesday.
While some parts of the country will have warm temperatures in the coming days, the humid overnight conditions will spread across the entire North Island and upper South Island, Crabtree said.
Most of the North Island is expected to have overnight lows in the upper teens and Hawke’s Bay could be on the warmest nights, and Napier’s forecast will not drop below 21C overnight on Monday and Tuesday.
Nighttime temperatures are expected to begin cooling on Wednesday.
“Starting Thursday, we have a significant change in the weather – everything is back to more average temperatures,” Crabtree said.
Most of the North Island is forecast to receive some rain on Wednesday. That is expected to include Northland, where the soil is much drier than normal for this time of year.
“All the rain that is currently happening over the lower North Island, that feature is shifting north a bit and that’s when we’ll start to see the rain start to develop over Northland,” Crabtree said.
But due to the nature of the system, he said it was difficult to give a more accurate forecast.
Auckland reached 25 ° C on Monday afternoon. It is forecast to drop to no less than 18 ° C overnight, before returning to 25 ° C on Tuesday.
Wellington had some rain and strong winds on Monday. More rain, along with gales in exposed locations, is forecast for Tuesday, and the temperature is expected to remain between 16 ° C and 18 ° C.
MetService said hurricane-force winds from the northwest are expected in exposed parts of Wellington, Wairarapa and the Marlborough Sounds through Tuesday night.
