Up to 40mm of rain is expected to fall in parts of the country today, according to a status yellow weather warning issued by Met Eireann.
Between 25mm and 40mm is set to fall in parts of counties Kerry and Cork; the warning was issued last night, June 7, and remains in place until 8:00pm tonight.
Heavy or thundery showers that fell during the night are expected to continue throughout the day, Met Eireann added.
These weather conditions are expected to remain in place until Saturday evening, June 10. Opportunities for spraying are set to be limited over the coming days, due to unsettled and breezy conditions.
Overnight rain will clear away into the Irish Sea this morning, Thursday, according to Met Eireann.
It is likely to brighten up for a time with the possibility of some sunny spells developing. However, very heavy and possibly thundery showers are forecast; there is a risk of spot flooding until later this evening.
Some heavy showers will persist early tonight, but these are set to become isolated and most places will become dry under broken cloud.
Patches of mist and fog are likely to develop as winds ease; temperatures are set to drop to as low as 7º overnight.
Tomorrow, Friday, is forecast to bring a mixture of cloud and sunny spells, with just the odd light shower.
In the afternoon, rain is set to affect southwestern counties; showers will then gradually spread northeastwards during the evening hours.
It will be mild, with highest temperatures of 16º to 19º; the best values will be experienced in the east of the country, according to Met Eireann.