Residents and visitors at Otama and Opito Bays are isolated due to road closures and remain so overnight. All local residents in those communities are safe, however.
Most of the local district roads were expected to be passable by 6pm after this afternoon's tide recedes.
However, Hikuai Settlement Rd may not be passable until much later this evening (9pm-10pm) and Blackjack Rd was likely to be closed overnight due to multiple large slips.
"If you can avoid travelling around the eastern seaboard this afternoon and overnight, do so," Civil Defence controller Garry Towler said.
"Although some roads may be marginal, we don't want people being caught out. There's also the risk of more slips as a result of the saturation."
Residents were encouraged to check-in on their neighbours, and phone 07 868 0200 with any concerns.
The Emergency Operations Centre would remain open until this evening.
MetService said the heavy rain today was due to a slow-moving low pressure system and an associated front lying over the upper North Island.
There was also a moderate risk of thunderstorms, and a low risk of downpours, about Northland, northern Auckland (north of about the Manukau Harbour) and northern Coromandel Peninsula.
These thunderstorms were likely to produce localised heavy rain with intensities of 10 to 25mm per hour, with a low risk of downpours (25-40 mm/hr) especially during this afternoon. Hail of 10 to 20mm in diameter was also possible.
Over the remainder of Auckland and the Coromandel Peninsula there was a low risk of thunderstorms throughout the day.
The severe weather was due to ease Tuesday evening.
State highway road closures:
• SH25 Tairua to Hikuai (near the Tairua River Bridge and near Hikuai Settlement Rd)
• SH25 Kuaotunu – this will likely be closed overnight
• SH25 Whitianga to Tairua (Kaimarama)
