Bay of Plenty residents can expect a decent downpour this weekend after more than a month without significant rainfall.

MetService meteorologist Lisa Murray said Cyclone Oma was feeding moist air across the Bay of Plenty that is likely to create heavy downpours.

She said the heaviest rain was expected this morning.

Rain is expected to ease to showers tomorrow morning, Murray said.

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Tauranga could possibly see a good 20mm of rain and Rotorua close to 10mm over Friday and Saturday, however, this number could change quickly as thunderstorms could develop and cause heavy downpours, Murray said.

The forecast was more uncertain than usual at the moment so it was hard to be sure.

The dry spell had caused hard soils across the region meaning surface flooding could result, she said.

Events planned for the weekend across the region may take a hit, with a number of event cancellations.

In Tauranga, the Tye Park Fireworks Fiesta was cancelled due to the chance of heavy rain and the Kids Gone Fishin Day set to take place this Sunday has been called off.

The Bike Tauranga Pedal Party will decide whether to go ahead at 7am on Sunday and Tauranga's inaugural Water Polo at the Waterfront event is going ahead as planned at its original location in the Tauranga Harbour.

In Rotorua, The Arts Village has decided to cancel its Art in the Park event, which was scheduled for Sunday, due to the rain forecast.

Farmers across the region would be thankful for any rain, Federated Farmers Bay of Plenty president Darryl Jensen said.

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However gentle rain would be preferred as soils were rock hard and heavy rain could create runoff, causing more harm than good.

Jensen said after long dry spells like this, it was common for heavy rain and cyclonic conditions to hit.

During the dry spell, a fire ban was imposed across the Bay of Plenty and a sprinkler ban was put in place for Tauranga residents.

A Tauranga City Council spokesperson said although the heavy rain will water gardens, the rainfall could make the water dirty and more difficult to treat.

"To be able to lift restrictions, we need to see water use go down, as well as consistent rain in the forecast to be sure that the dry period is firmly behind us."

Water restrictions are put in place when water usage nears the maximum amount of water the council is able to treat in a day.

Western Bay of Plenty Council utilities manager Kelvin Hill said they will be keeping a watchful eye on flooding hotspots such as Waihi Beach, Katikati and Te Puke.

The council will work to make sure all outlets are clear and are urging Western Bay residents to check their own systems, such as guttering and downpipes for blockages.

Infrastructure general manager and primary CDEM controller Stavros Michael from the Rotorua Lakes Council said pump stations are monitored during weather events to ensure the system is coping with water intake.

Council officers also worked alongside Bay of Plenty Regional Council's flood protection teams to monitoring flow levels in waterways.

The Lakes Council asked residents to ensure they have adequate supplies at home in case of a power cut and any low-lying properties are advised to move any important objects from floor levels in case of surface flooding.

Forecast:

Tauranga-

Today : Rain settling in by evening, high of 25C.

Tomorrow : Heavy rain expected in the morning, possibly clearing in the evening, high of 26C.

Sunday: Possibly heavy showers in the morning, clearing in the afternoon, high of 23C.

Rotorua-

Today : Showers turning to rain this evening, high of 22C.

Tomorrow : Heavy rain expected in the morning, possibly clearing in the evening, high of 24C.

Sunday: Periods of rain, clearing later, high of 19C.