MetService has issued three heavy rain watches for parts of the South Island to start the week, as muggy overnight temperatures in the North may have some reaching for the fan.
The forecaster said a period of heavy rain was expected to hit Fiordland and southern Westland on Monday, and then to move eastward across the country on Tuesday, bringing the rain to parts of Canterbury and Marlborough.
Heavy rain watches were issued for Marlborough south of Seddon, and Canterbury north of the Rangitata River from 2am Monday, Westland south of Franz Josef Glacier from 6am Monday and Fiordland from midnight Sunday.
In keeping with the un-summery weather in the South, an area of low pressure which developed in the Tasman Sea was expected to follow the rains, producing cold air across eastern parts of the island.
It said Kiwis in the area could even expect a chance of snow.
"Currently forecast to reach as low as 1200 metres; if you're heading up into the hills this week, make sure you're prepared for the chance of snow," it said online.
Auckland, Northland in for muggy 29C tomorrow
Meanwhile, in the North Island, a MetService spokesperson told 1News that high temperatures were expected.
They said a tropical low travelling from Fiji would bring down moist, hot air and trigger muggy weather in Auckland and the far North tomorrow.
"Auckland is seeing a high of 29C tomorrow, which is close to their heat alert threshold. Whenuapai and Whangārei are also reaching 29C."
"The warm air over the cold sea in inshore areas will create seafog in those areas and may also blow inland, adding to the muggy temperatures," the spokesperson said.
Southerly winds were also expected near the Cook Strait on Tuesday, but MetService said there was a low chance they could become strong enough about the Marlborough Sounds, Wellington, and southern Wairarapa to require a warning.
Thunderstorms are held to a low risk level right across the country.
MetService advised people keep up to date with the latest forecasts online.
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