Cork County Council have said they are erecting a number of flood barriers after heavy rains last night.
In a statement, they said: "There has been very significant rainfall overnight last night, with 73mm (almost 3 inches) in the North West of county and 49mm (almost 2 inches) in Mallow.
"As a result flood barriers have been erected in Mallow and Fermoy."
Three weather warnings are now in place across 10 counties.
Winds of up to 95 km an hour are expected in Galway, Mayo, Clare and Kerry.
A rainfall warning also remains in place for Cork, Kerry, Waterford, Kilkenny, Wexford, Clare, Limerick and Tipperary until 3pm this afternoon.
A flooding warning is going out to parts of the country today.
Heavy rainfall of between 30 and 50 millimetres is expected in Cork, Kerry and Waterford.
Met Eireann is also putting out a second alert for up to 30 millimetres of rain in Kilkenny, Wexford, Clare, Limerick and Tipperary.
Michael Roland from the Road Safety Authority has this advice for motorists driving through heavy rain.
He said: "The RSA are warning drivers to be aware of precipitous heavy rainfall this morning and throughout today.
"We are advising drivers to exercise caution on the roads; drivers need to be aware that it takes longer to stop a vehicle on wet roads.
"They need to slow down and allow extra distance between them and the vehicle in front."