Met Eireann has issued a Status Yellow weather warning for Dublin.
The rainfall alert will be in place from 8 pm tonight until 8 am tomorrow morning.
The national forecaster has warned of localised surface and river flooding due to "the combined effect of rainfall and snow melting".
A Met Eireann spokesperson said: "A spell of rain tonight into Monday morning will lead to accumulations of between 20 to 25mm, with higher totals possible in upland areas.
"The rain is likely to be preceded by a period of sleet and snow in parts of Connacht, Ulster and north Leinster, with hazardous driving conditions for a time, before turning to rain later.
"As the ground is saturated at the moment and river levels are elevated the combined effect of rainfall and snow melt may lead to some localised surface and river flooding."
The warning is also in place for Connacht, Cavan, Monaghan, Donegal, Kildare, Laois, Longford, Louth, Wicklow, Offaly, Westmeath, Meath, Clare, Limerick, and Tipperary.
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