MetService has issued a Severe Weather Outlook for parts of New Zealand.

On Monday, a front moves quickly north over the South Island during the first part of the day, and over the North Island during the second part of the day, says a MetService spokesperson.

"Consequently for a time during Monday, there is moderate to high confidence that rainfall accumulations will meet warning criteria about Westland."

While for Southland and Otago early Monday morning, the Canterbury headwaters, Buller, the west of the Tasman District during Monday morning, and the Tararua Range and Taranaki during Monday, there is low confidence that heavy rainfall will reach warning thresholds.

Also for a time on Monday, there is low confidence that northwest gales may be severe about the Canterbury High Country, the ranges of Marlborough and Marlborough Sounds, and also about Wellington and Wairarapa.

A ridge of high pressure should bring a minimal risk of severe weather to New Zealand during Tuesday and Wednesday.

On Thursday a frontal wave may possibly bring heavy rainfall to Northland, but at this stage there is significant uncertainty regarding impacts, and MetService will continue to monitor the situation.