Cork City Council has issued a weather alert for the coming days.
There are concerns that heavy rain, high tides and southeasterly winds could lead to tidal flooding in the city centre.
Flooding is possible in the low lying areas of the city centre.
Householders and businesses are being urged to take precautionary measures to protect property.
At risk areas include South Terrace, Trinity Bridge, Rutland Street, Cotter Street, Stable Lane, Union Quay, Morrisons Quay, Proby's Quay, Frenchs Quay, Crosses Green, Sharman Crawford St, Wandesford Quay, Lavitts Quay, Kyrls Street & Kyrls Quay, Coal Quay and Lapps Quay.
Other areas potentially at risk are South Mall, Oliver Plunkett Street, Pembroke Street, Princes Street, Marlborough Street, Cook Street, Winthrop Street, Kennedy Quay, Centre Park Road, Monahan's Road and Georges Quay.
Meanwhile, a flood alert for Fermoy has been lifted for now.
The town's bridge remained open overnight despite fears it would have to close because of flooding.
The peak flood time passed without any major incident.
However, the Mill and Tallow Roads, Ashe Quay and the old mart car park all remain closed because of Sunday's heavy rain.
Gardaí also reported trees down in some areas and asked motorists to take care.
High tides in Cork city
1 January 4.59am and 5.22pm
2 January 5.51am and 6.12pm
3 January 6.40am and 6.59pm
4 January 7.27am and 7.47pm
5 January 8.15am