A fresh bout of weather warnings and watches is being issued as heavy rain continues around the country.

A severe weather warning has been issued for the Coromandel Peninsula and a watch is in place for the Bay of Plenty.

The MetService says a moist northerly flow is expected to bring heavy rain to many areas.

"Heavy rain is expected to affect northern and western parts of the South Island through to Tuesday," says a spokesperson for the weather organisation.

"Heavy rain is also forecast to affect northern and western parts of the North Island from Tuesday.

"People are advised to keep up to date with the latest forecasts."

Image: MetService.

Heavy Rain Watch

Area: Bay of Plenty
Valid: 14 hours from 4pm Tue 9 May to 6am Wed 10 May
Forecast: Periods of heavy rain are expected. Rainfall accumulations may approach warning criteria, especially in the east.

Heavy Rain Warning - Orange

Area: Auckland including Great Barrier Island, and Coromandel Peninsula
Valid: 12 hours from 12pm Tue 9 May to 12am Wed 10 May
Forecast: Periods of heavy rain, with squally thunderstorms possible. Around 50 to 70 mm is expected, but possibly more in localised areas. Intensities of 10 to 15 mm per hour, but thunderstorms and downpours of 40 mm per hour or more are possible in localised areas.