Sweltering Kiwi summer could add thunder to the mix today

New Zealand's hot, humid summer is not letting up with today set to be particularly warm, especially in the south.

Alexandra is tipped to reach 34 degrees and Invercargill picked to hit 29, with pretty much everywhere else likely to bask in the mid to high twenties.

Check the forecast in your region on the 1 NEWS NOW weather page

MetService says it's all down to warm air from the tropics remaining over New Zealand, boosting both temperatures and humidity.

TVNZ weather presenter Dan Corbett with the latest update. Source: 1 NEWS

Yesterday's moderate risk of thunderstorms for parts of both islands is heightened today for the North Island, the forecaster says.

A severe thunderstorm watch was in place for Northland from yesterday afternoon until early this morning. 

There's a reasonable chance of isolated thunderstorms with downpours today just about anywhere in from the coast and north of Palmerston North, MetService says. 

A heavy rain watch is also in effect for much of the upper North Island through to this afternoon.

TVNZ weather presenter Dan Corbett with the latest update. Source: 1 NEWS

And if you're hoping for quick relief from the sticky conditions, you're probably out of luck.

MetService says the pattern of warm days and afternoon heat showers is set to continue through to at least next weekend. 

It says several new temperature records could be set by the end of the month, with many centres already well above the January average.

Breakfast weatherman Matty McLean has the latest weather update. Source: Breakfast

Hefty fines loom for Auckland property developers polluting waterways, leaving rubbish

Auckland council is cracking down on property developers, issuing fines to those polluting waterways and leaving rubbish.

One street at Flatbush in East Auckland was targeted today, with 13 of the 15 building sites failing to meet environmental standards.

"There's more of a keenness to build the properties than there is to actually look at how that's affecting the environment," said Adrian Wilson of Auckland Council compliance.

The big problem is what's in the gutter on the street concerned. Clay, cement and other sediments are streaming off the building sites, clogging up the stormwater system and polluting waterways.

"We've got issues around our water quality as it is, especially in the Manukau. And this is all going into the Manukau Harbour and degrading it further," said Linda Cooper, Auckland councillor. 

Developers on the street were given a week to clean up and contain their sediment run-off and today the council was back with the threat of fines.

"Manage the driveway, don't let the clay go on the driveway. Don't let it go on the footpaths. Just tidy up your site everyday," was the message from Councillor Cooper.

Adding to the environmental woes, contractors' leftover materials had been left on the footpaths and, more alarming, of household rubbish illegally dumped. 

"They're dumping it on the berms here, hoping that the building people will pick it up for them. Well it's not going to happen," Councillor Cooper said.

A nearby stream is already showing signs of the rubbish and silt build-up.

"You times that by the rest of the building work that's going on in the area and you've got a big problem," Mr Wilson said.

As a result of today's sting, the council says it will be issuing a number of abatement notices, hitting the developers hard in the pocket with $750 a day until they put it right.

"It's not a hard process. It's quite simple. We've produced brochures to educate them but they just fail to take any notice," Mr Wilson said.

The next step could be prosecution, with penalties up to $600,000.

Clay, cement and other sediment has been streaming off the sites in East Auckland, with over a dozen failing environmental standards. Source: 1 NEWS