Your weather: Rain to settle in across the country 1 Jan, 2021 07:09 AM 2 minutes to read MetService National weather: December 31st - 2nd January. NZ Herald Most of the North Island enjoyed fair weather on New Year's Day but it was a different story for the South Island, and the rain is set to spread. MetService forecaster Aidan Pyselman said the first day of 2021 brought clear skies for much of the North Island, with hotspots reaching 28C in Masterton and Blenheim. But it was "not so flash down south" with rain and thunderstorms overhead in inland Canterbury about the hills and ranges.