More than 20mm of rain drenched Tauranga today(Monday).

Metservice recorded a whopping 15.8mm of rain between 8am and 10am, contributing to the wettest day of the month so far.

A total of 21.8mm fell this morning, according to Metservice.

More heavy rain was expected.

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A severe weather watch was issued for the Bay of Plenty, warning of thunderstorms.

The heavy rain was expected to ease to showers .

MetService duty forecaster Tom Adams said the worst weather was reserved for north of Auckland which was expected to bear the brunt of strong winds and hail.

Some parts of the island would see up to 70mm of rain fall over the next 24 hours, he said.