Met Éireann is forecasting cooler and more unstable weather over the coming days.
There is a possibility that intermittent heavy rain could lead to localized flooding on Saturday, the forecaster said.
Some sunny spells and showers are likely to break through during the day, although rain will continue for longer in the south and east. Maximum temperatures of 8 to 11 degrees are expected with a light to moderate northerly breeze.
Saturday night will see heavy and persistent showers in Atlantic counties, but will be drier and clearer elsewhere. In protected areas there may be frost with minimum temperatures of 2-6 degrees.
Fog and mist will clear Sunday morning, giving way to a day of sunny spells with scattered showers to the east. The western half of the country will see the heaviest rain, causing localized flooding, with temperatures reaching highs of 9 to 12 degrees.
Later, heavy showers will occur along the Atlantic coasts, while longer, clear spells are forecast in the east. Lowest temperatures of 5-8 degrees are expected with moderate, at times fresh westerly winds.
Monday will start with sunny spells and showers as the rain will be heaviest in the northwest. It will become cloudier in the afternoon as isolated rain showers move in off the Atlantic.