The MetService said southwesterly winds would continue to bring showery weather.
"Heavy showers are mostly now affecting places like Northland and Auckland," said meteorologist Peter Little.
"Some could be heavy and thundery during late morning time and through the afternoon but it's unlikely it will be quite the display of thunder activity that we have seen in the last couple of days in Auckland.
Rain made the mud run at Arahoe Primary School in New Lynn, West Auckland, more of a mud bath and people crawled and pulled their way through the muddy obstacles.
Thousands of people taking part in the marches for Moko held around the country also struggled to keep dry as showers came and went.
Mr Little said the Waikato and Auckland would continue to switch between sunshine and showers for the next few days.
Hawkes Bay and Gisborne were the best places for fine weather.
The cold snap was expected to continue as the temperature fell a couple of degrees from last week.