A heavy rain watch has been upgraded to a warning for Bay of Plenty.
The warning has been issued from tomorrow into Wednesday, however, rain has been falling consistently in the region this morning.
Very warm and humid conditions are likely, with the heaviest rain expected between 3pm Tuesday and 11am Wednesday, MetService said.
Rainfall of 130 to 180mm is expected in inland Bay of Plenty with 70 to 100mm about the coast.