A severe weather warning has been issued for Bay of Plenty and Rotorua.
MetService is forecasting heavy rain about the Eastern Bay, easing overnight tonight.
It said a front moving onto eastern Bay of Plenty and northern Gisborne should move away to the east overnight, with the heavy rain about the ranges there easing.
"A further 25 to 50mm of rain is likely in these areas from Monday evening through to the early hours of Tuesday, on top of what has already fallen.
"Although this is not an exceptional amount of rain for these areas, people there, especially trampers, are advised to look out for rapidly rising rivers and streams as well as possible surface flooding and slips."