Cork City Council has advised home and business owners to take steps to protect their properties, after issuing a flood warning for parts of the city centre over the next four days.
The risk is said to be greatest at high tide tomorrow morning.
A number of factors are expected to combine to cause tidal flooding on several streets.
These include a high tide, a low pressure area, heavy rain and southeasterly winds.
Met Éireann says it expects rainfall of around 25mm between 5pm this evening and 9am tomorrow.
Southeasterly winds, which are a contributory factor to flooding in Cork city, are expected to reach gale force.
A tidal surge is also expected to result in flood water on a number of streets.
It is not known at this stage if flood waters will rise to the extent that buildings will be flooded too.
Cork City Council says the areas at risk of flooding include South Terrace, Trinity Bridge, Georges Quay, Cotter Street, Stable Lane, Union Quay, Morrisons Quay, Proby's Quay, French's Quay, Crosses Green, Sharman Crawford Street, Wandesford Quay, Lavitts Quay, Kyrl's Street and Kyrl's Quay, Coal Quay, South Mall, Oliver Plunkett Street, Pembroke Street, Prince's Street, Marlborough Street, Cook Street, Winthrop Street, Kennedy Quay, Centre Park Road and Monahan Road.
Separately, Cork County Council has warned that very high spring tides may cause flooding in coastal parts of the county at times between now and next Tuesday.