A Status Yellow rainfall warning has been issued for Donegal with some heavy showers having already hit the county this afternoon (Fri).
Donegal is forecast to get between 20mm and 30mm of rain from 8pm tonight until 2am tomorrow morning.
A forecaster said: “Heavy rain this evening and early tonight with some spot flooding. Totals 20 to 30 mm.”
And heavy rain will batter most parts of the country on Saturday, with areas in the south and east expected to experience flooding.
The national forecaster cautioned: “Heavy downpours of rain expected with totals 30-40mm with spot flooding likely especially near the coast.
“Saturday night will be wet as persistent or heavy rain over Munster and Leinster continue with risk of spot flooding.
“It is not certain yet if this rain will extend over Ulster and Connacht, but there is good possibility that it will.
“The rain will eventually clear eastwards overnight with clear spells following. Lowest temperatures of 9C to 11C.”