MetService is forecasting warm, wet and muggy weather next few days, then a break in the cloud and rain by the end of the weekend.

As streams of warm, moist air from the Tasman Sea continue to flow over the country, it's a messy start to the weekend for most. Many places are likely to get some wet weather by the end of Saturday.

MetService meteorologist Mmathapelo Makgabutlane says the western South Island gets the heaviest rain, where a Severe Weather Warning has been issued starting tomorrow morning.

"Up to 300mm of rain is forecast for parts of Westland, which means hazardous driving conditions and rapidly rising rivers are possible.”

Although rain makes it to the eastern parts of the country at times between Friday and Saturday, things look to only remain favourable for the early evening trick-or-treating slot in the eastern North Island and parts of eastern South Island.

'For the rest of the country, it would be wise to have an indoor alternative for those Halloween celebrations on hand or incorporate a raincoat into your Halloween costume.,” Mmathapelo advised, as rain look set to feature for many.

In addition to cloudy and rainy spells, Saturday into Sunday brings those familiar breezy northwesterly winds for central New Zealand, as a cold front approaches the country from the southwest.

'With strong winds subsiding and breaks in the cloud, the end of the weekend is looking a treat."