Persistent and heavy rain is forecast for Wednesday and Thursday before drier conditions and some sunny spells this weekend.
According to Met Éireann, there is a risk of localised flooding this evening, especially for Atlantic coastal counties.
It will then turn cooler and more settled through Friday and for the weekend, with high pressure building.
This was the latest update from Met Éireann ahead of public service strike action which commenced at midnight.
On Wednesday, it will be dry in the morning and early afternoon, apart from the chance of a few spots of drizzle, and with some bright or sunny spells in the south and east, though it will become cloudy generally.
Later in the afternoon and evening, persistent and heavy rain will move into the northwest and west.
There will be highest temperatures of 14 to 17 degrees.
Wednesday night will see persistent rain, heavy at times.
Rain will continue to extend from the northwest, bringing the chance of localised flooding, especially for Atlantic coastal counties.
However, some southeastern areas will stay dry until morning.
There will be lowest temperatures of 8 to 12 degrees generally, milder for some southern and eastern areas.
Thursday will be a wet morning with fairly widespread rain, heavy in places with localised flooding, especially in Atlantic coastal counties.
Through the morning, there will be a clearance to sunny spells and some showers move into the northwest.
The rain will become mostly confined to southeastern and eastern areas by the evening, and winds near Atlantic coasts will freshen at times, with highest temperatures of 12 to 16 degrees.
On Thursday, any lingering cloud, rain or drizzle in the southeast will clear early in the night, becoming largely dry and clear for most, though showers will feed in from the west, mainly affecting Atlantic coastal counties.
A few of the showers may be heavy, with lowest temperatures of 4 to 8 degrees.
Friday will be a bright day with sunny spells and scattered showers in the morning and early afternoon, easing from the south and becoming mostly dry for the evening.
It will be a cooler day with highest temperatures of 11 to 14 degrees.
Friday night will be largely dry, clear and chilly night. A few isolated showers may occur near northern coasts.
Lowest temperatures will range from 1 to 5 degrees.
Saturday will see mist and fog clear through the morning to leave a dry day with sunny spells for most.
Highest temperatures will range from 11 to 13 or 14 degrees.
Mist and fog will again clear through the morning on Sunday.
Otherwise, there will be a mix of cloud and sunny spells. It will stay dry for most; however, the odd stray shower cannot be ruled out.
There will be highest temperatures of 11 to 14 degrees.
Current indications suggest that there will be rain at times early next week before turning drier for midweek. Temperatures will increase slightly too.