Snow is expected to hit parts of Leinster, Munster and Connacht today as temperatures plunge to -1C.
Met Eireann has issued a Status Yellow rain warning for Carlow, Kildare, Kilkenny, Laois, Wicklow, Offaly and Tipperary, which they believe will turn to "sleet and snow" and lead to "spot flooding".
A spokesman for the national forecaster said: "Generally cloudy with showers or longer spells of rain, light in northern areas but heavy at times elsewhere with a risk of hail and thunder.
"Top temperatures 5 to 8 degrees. Some of the rain will turn to sleet and snow in parts of Munster, Leinster and Connacht. Brisk northwest winds in the southwest today, but winds lighter and more variable elsewhere.
"The wintry mix of rain, sleet and snow will gradually clear southwards tonight.
"Cold clear spells will develop, with frost and some icy patches developing. Lowest temperatures of -1 to plus 3 degrees."
Thursday will be cold, dry and sunny for most of the day, with some showers affecting coastal counties in Leinster, Connacht and west Ulster.
It will be another bitterly cold night tomorrow, with temperatures again getting as low as -1 degrees.
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Friday will be quite similar to Thursday, starting out sunny before showers arrive on the east coast.
Night temperatures will rise slightly, hovering between 1 and 3 degrees, but may lead to sharp ground frost and some icy patches.
Some mist is also expected on Friday evening.
Saturday is to be cloudier, with a few bright spells early in the day.
Patchy rain and drizzle will hit Atlantic coastal counties in the late morning, spreading slowly eastwards throughout the day.
It will be cold, with highs of just 4 to 8 degrees.
