A status yellow rain warning will continue across Co Monaghan today.
Orange and yellow warning's for more heavy rain are now also in place for counties in the east and south east.
A yellow alert for Carlow, Kildare, Kilkenny, Laois, Louth, Wexford, Monaghan and Tipperary continues until 3 o'clock tomorrow morning, with Wicklow and Waterford under the orange warning.
Now Met Eireann's put Dublin under an orange rain alert from midday today.
More heavy rain will fall on already saturated ground , and combined with high river levels and high tides it will lead to localised flooding, river flooding and difficult travelling conditions.
David Martin from the Road Safety Authority says its going to be challenging on the roads: