Showers or longer spells of rain are expected today, with a risk of thunder across Leinster, according to Met Éireann.
Some sunny spells will develop at times with drier, brighter conditions across the west and south-west. Temperatures will reach 7 to 9 degrees today and will drop between 1 and 5 degrees tonight.
Persistent and occasionally heavy rain is expected near the east coast this evening and early tonight.
It will be largely dry at first elsewhere, with variable cloud and occasional showers. Rain in the east will spread westwards over the country overnight, producing spot flooding; patches of mist and fog will form.
There is a risk of frost where clear spells prevail in the west and southwest.
Saturday – The national forecaster predicts that tomorrow will be a rather dull and wet day in midland, eastern and northern areas.
There will be outbreaks of rain - some of which will be heavy at times.Drier and brighter conditions are expected with occasional showers; mist and fog patches may be slow to clear in these parts in the morning.
Temperatures to range between 7 to 10 degrees and will fall between 0 to 5 degrees tomorrow night, with a risk of frost.
Rain will clear gradually over the midlands, north and east; dry, clear intervals in the south and west will extend nationwide by dawn. Mist and fog patches will form.
Sunday – Any early mist, fog and residual drizzle patches will clear, according to the Irish National Meteorological Service.
Cloud will thicken in the west and south, giving rise to outbreaks of rain in Munster during the morning.
Cloud and rain will gradually spread north-eastwards over the country during the afternoon – the heaviest of the rain is likely to descend on southern and later eastern coastal counties;
Temperatures will be in the region of 7 to 11 degrees during the day with lows of 4 to 8 degrees on Sunday night.
There will be further spells of rain with moderate to fresh east to south-east winds, strong and gusty on western, northern and eastern coasts for a period.