A cold front moves northwards over the North Island on Monday morning then another cold front pushes in hitting the lower South Island overnight.
Expect some rain for the upper North Island on Monday morning then easing to showers in the afternoon as westerlies tend a little more southwest for a time. By evening long dry spells will develop although showers may continue to affect Northland through the night.
Early morning rain for the lower western North Island eases to showers, winds gusty from the west then easing from afternoon. The east coast sees morning high cloud with the chance of a spot of rain then becoming mostly sunny in the afternoon, winds from the northwest (a little gusty about the Wairarapa) then easing late afternoon, perhaps tending southwest for a time later in the day. Temperatures will get into the high teens or perhaps early twenties about Hawkes Bay and Gisborne.
Any early heavy rain for the West Coast of the South Island quickly eases to occasional showers and southwesterly winds, later in the evening rain moves into Fiordland becoming heavy then pushing northwards overnight. Morning rain or showers for the east coast clearing then becoming mostly sunny in the afternoon, cool southwesterlies quickly ease. Later in the evening northwesterly winds build especially inland.
Morning rain for Southland quickly eases to showers and they will likely hang around for most of the day, winds gusty from the west.
Image – Monday 21st May 2018 3pm MSLP / Rain map – weathermap.co.nz