Met Eireann has issued a Status Yellow Rain warning for eight counties as bands of heavy rain spread across the country.
Carlow, Kilkenny, Wexford, Wicklow, Cork, Kerry, Tipperary and Waterford will see spells of heavy rain overnight Tuesday through to Wednesday night which will lead to localised flooding.
The warning will take effect for these counties at 4am on Wednesday morning and remain in place until 10pm.
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A forecaster said: "Areas in Cork that saw flooding yesterday should especially be aware of the heavy rain expected between Wednesday and Friday. Take today and tomorrow when dry as opportunity to clear drains etc."
Meanwhile, tonight will be mainly dry and turning cold in long clear spells with lowest temperatures of 0 to 5 degrees generally.
A touch of grass frost may form in the midlands as mist and fog patches also form in light southeast or variable breezes.
Milder in parts of the south and southwest, with cloudier conditions developing along with freshening winds. Patchy light rain or drizzle will arrive in the southwest towards morning.
Some mist or fog will remain in parts on Tuesday, clearing in the morning for a largely dry and sunny day. Cloudier in the southwest with occasional light rain or drizzle.
Becoming breezy later, especially in the southwest, where southeast winds will increase fresh or strong. Highest temperatures of 12 to 16 degrees.
Outbreaks of rain in the southwest with heavy falls in places on Tuesday night will extend northeastwards though much of Ulster and north Leinster will stay dry till morning.
Lowest temperatures of 7 to 11 degrees generally in moderate to fresh easterly winds, milder though in southern and southwestern parts.
Wednesday will be a wet and cloudy day with widespread outbreaks of rain, heaviest and most persistent in the south and southwest, with localised flooding possible.
Highest temperatures of 11 to 14 degrees generally, reaching up to 15 or 16 degrees in parts of the south and southwest. Easterly winds will be mostly fresh and gusty.
A mild night as the rain pushes northeastwards with a clearance from the southwest to drier and clear conditions following later.
Temperatures won't fall below 9 to 12 degrees in moderate to fresh and gusty east to southeast winds.
Things will become largely dry on Thursday, with sunny spells as the last of the overnight rain clears the northeast and east.
There will be some patchy rain and drizzle, mainly over the country's southern half—highest temperatures of 14 to 17 degrees with freshening southeast winds.
Outbreaks of rain in the southeast early in the night will extend northwards overnight though much of Ulster will stay dry till morning.
Another mild night with temperatures not falling below 10 to 13 degrees in fresh to strong and gusty southeast winds.
Widespread outbreaks of showery rain will continue to extend northwards on Friday, with a clearance to sunny spells moving into the south later in the afternoon.
Highest temperatures of 14 to 16 degrees generally.
Continuing unsettled through the weekend, with highest temperatures remaining in the mid-teens.
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