Parts of Wellington are now experiencing a meteorological drought, according to Niwa.
Some areas of the Kapiti Coast, Horowhenua and South Wairarapa are affected. It has been 29 days since there had been any rain in Wellington, and 34 days for Martinborough and Paraparaumu.
Niwa's Chris Brandolino said areas around Manawatu and Whanganui were also at critical near-drought levels.
Much of the lower North Island, along with Taranaki, Napier and Hastings, was either dry or very dry.
But parched areas of Canterbury are set for a reprieve today as a front makes its way across the country, bringing temperatures of around 20C - some 10C cooler than the highs clocked up in the past week.
Yesterday the region broke its 64-year-old record of continuous days without rain, ticking up 46 days at 9am at the Christchurch Airport weather station.
Brandolino said the country was in a La Nina weather pattern for summer, which was characterised by higher pressure than normal to the south and southeast of the country, and lower pressure than normal to the north.
Although the country experienced La Nina last summer, each was different, bringing with it their own weather patterns.
"La Nina doesn't happen in a vacuum," he said.
MetService confirmed the area is in line for some light, but steady, showers for most of the day today.
The rainfall is the remnants of the front currently giving the West Coast and Fiordland a good soaking after a couple of weeks of dry weather.
Temperatures across the country will also ease slightly later in the week as the southerly makes its way up the country.
Wellington may be due for showers on Wednesday but they would not have any effect on the dry conditions, according to the MetService.
MetService meteorologist Andy Best said isolated showers north of Auckland and about the ranges and central North Island would spread onto the south of the North Island on Wednesday.
Wellington will be due for showers but they will not have any effect on the dry conditions, according to the MetService.
A few showers. High 25C, Overnight 16C
A few showers. High 24C, Overnight 17C
Morning cloud, then fine. High 25C, Overnight 13C
Fine with southwesterlies. High 27C, Overnight 16C
Fine, northerlies dying out. High 23C, Overnight 14C
Rain develops, southerlies. High 20C, Overnight 11C
Fine spells, showers in evening. High 17C, Overnight 10C
Early rain, then fine. High 19C, Overnight 7C