People are being asked to avoid the M50 in Dublin as many sections of it are affected by flooding.
Gardaí are warning of potential serious problems on the motorway this afternoon as match traffic for Croke Park builds up.
The Dublin Port Tunnel Southbound has been re-opened and will be toll-free until 4:00pm to accomodate traffic going to Croke Park.
Meanwhile, a clean-up operation is underway in Dublin and Kildare following flash flooding yesterday.
Gardaí say flood water has subsided in most areas, but parts of north county Dublin are still badly affected.
The N3 near Blanchardstown is closed in both directions and should be avoided if possible.
The M1 is closed at Shantalla Bridge and will remain closed for several hours an diversions are in place.
Those travelling northbound to Dublin Airport are advised that a section of M1 is closed at Whitehall and traffic is diverted to Santry.
A contra-flow is in operation along the M50 between Finglas and Blanchardstown.
Met Éireann has said that in the 24-hour period from midnight Friday until midnight on Saturday 76.2mm of rain was recorded at Dublin Airport.
This is a new record for the month of August.
The previous record was 73mm which was recorded in August 1986.
Celbridge floods
Kildare County Council says Celbridge experienced bad flooding also.
Eight houses in the Vanessa Close Estate were flooded with water reaching about 60cm.
It was caused by the Toni River, a tributary of the Liffey, which is backing up.
The County Council has secured a boat from the Civil Defence to try to clear the blockage that it is hoping will be completed by lunchtime.
The Clane to Celbridge Road is closed because of flooding and is expected to remain closed for most of day.
The Ardrass Road from Straffan to Celbridge is also closed and will remain so for the rest of the day.
Celbridge also experienced serious problems with sewage flooding onto the street, caused by pumps being flooded.
The pumps are now working again but Main Street is still affected by the sewage, which has also damaged some premises.
4,000 scouts in Punchestown had to spend the night indoors after being removed by the Civil Defence to the major events centre on the site.
Leixlip and Maynooth also experienced flooding, but the county council is not aware of any damage to property.
Tullamore Show cancelled
Elsewhere, in Co Laois the Ballyroan to Portlaoise Road is flooded at Cashel Cross after a river burst its banks.
In Co Offaly, the Tullamore Show, which was due to take place today, has been cancelled for the second year running due to the weather.
Meanwhile, rail services have resumed between Malahide Station and Howth Junction.
Iarnród Éireann says all its lines have now reopened and its services are running as normal today.
Dublin Fire Brigade says it had a very busy night with all areas of the capital affected by flooding.
The Fire Brigade says flooding was particularly bad in Swords and that a number of premises in the north city centre were flooded, with Drumcondra badly affected.
Houses in the Knocklyon and Firhouse areas of south Dublin were flooded.
The main drain section of Dublin City Council was called out to help ease the flooding, which was made worse by high tide.
The Civil Defence was also called in to help pump water.
On the M50 a bus full of people heading to Dublin Airport got stuck in the floods and had to be pulled using a tractor.
Racing at the Curragh has been cancelled due to a waterlogged track.
Organisers of the annual Steam Threshing Festival in Moynalty, Co Meath say it will go ahead despite last night's heavy rainfall.
Thousands of people are expected to travel to the event, which is now in its 33rd year.
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