Remaining overnight rain and fog will clear northwards this morning, according to Met Éireann.
Dry, bright spells are expected for a time, although showery rain will push in from the Atlantic.
This, according to the national forecaster, will become widespread, leading to heavy and possibly thundery bursts in places with highs of 12 to 15 degrees.
Heavy showers will continue throughout the night, with high rainfall accumulations possible in the south-west.
There will be strong winds around western and southern coastal areas, with lows of 3 to 5 degrees in the east and 6 to 8 degrees elsewhere.
Saturday – Met Éireann predicts that heavy rain will descend upon Munster, Leinster and Connacht, with lighter showers in store for Ulster.
It has warned that there is a risk of strong westerly winds in the south and parts of the west; winds will be lighter elsewhere, as the low pressure centre moves across the county.
Temperatures will reach 10 to 12 degrees on Saturday.
Sunday – Further showers are expected, with mainly light westerly winds to become variable later.