A westerly airflow lies over the North Island today and a weak low covers the south Island. An area of low pressure brings rain to the upper North Island from afternoon on Saturday meanwhile further south over the South Island another area of low pressure brings the chance of unstable conditions in the afternoon for some.

Sunny spells for Northland through to Waikato today, there may be a shower at times mainly in the west. Mostly sunny about the Bay Of Plenty. A dry morning for the lower western North Island then showers develop in the afternoon, easing overnight. Mainly dry in the morning for the east coast also, showers from afternoon possibly heavy with thunderstorms (mainly about the ranges) then easing at night. A fair majority of the South Island starts off dry then showers develop in the afternoon, especially for inland areas. Coastal parts could stay dry but showers may spread in during the evening. Showery conditions ease overnight.

Rain spreads southwards over the upper North Island during Saturday afternoon, rain may be heavy especially Auckland northwards. A morning shower or two for the lower western North Island then mainly dry. Some rain may spread into Hawkes Bay and Gisborne overnight, dry during the day. A light shower could affect Wairarapa from late morning. A shower or two for the West Coast of the South Island, rain develops in the morning for the lower South Island then easing to showers during the afternoon. Showers about Canterbury in the afternoon may become heavy with thunderstorms and hail then easing in the evening.

By Weather Analyst Aaron Wilkinson – WeatherWatch.co.nz