A weather warning is in place, with heavy rainfall forecast across the country today and tomorrow.
Met Éireann meteorologist Gerald Fleming said that the forecast is for "a month's rain in two days".
Between 45mm and 90mm of rain is forecast for some parts of the country over the next 24 hours.
AA Roadwatch says that road conditions are extremely wet in most parts of the country, making for hazardous driving conditions.
Motorways are particularly hazardous, where there is excess surface water to contend with, however no major flooding has been reported.
Motorists are advised to slow down and to use dipped headlights to improve visibility.
Munster and Connacht are expected to be the worst affected with up to 60mm of rainfall expected.
Between 30mm and 50mm of rain is forecast to fall in Leinster and Ulster.
The Coast Guard has said that the combination of tides, high winds and swollen rivers may lead to dangerous conditions.
It is urging people not to cross fast running rivers or floodwater fords and to be aware of hazards in urban areas including submerged manholes and downed power lines.
People should stay away from the shoreline and not engage in watersports.
Farmers have said that in recent days rain is hampering the harvesting of silage.
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