An arc of heavy rain and blustery showers will lash Ireland today.
The mercury is also set to plunge with some areas going below zero on Friday night, according to Met Eireann, with the biting cold to drag on to the weekend.
Met Eireann forecast that rain in the west and north will continue to spread across the country this afternoon, becoming patchier as it does so before clearing eastwards to showers this evening.
There will be lowest temperatures of 0 to 4 degrees.
Met Eireann said: "Thursday will see outbreaks of rain in the west and north will drift further eastwards before easing for a time.
"However, Further showers or longer spells of rain will spread into Atlantic counties through the morning and become widespread in the afternoon.
"Thursday night will be wet with rain spreading eastwards across the country, becoming heavy at times.
"The rain will clear overnight with colder, clearer conditions with scattered heavy showers of rain, hail or sleet."
Friday will be a cold, blustery day with sunny spells and widespread heavy showers or rain, hail or sleet and with a risk of isolated thunderstorms. Highest temperatures of just 4 to 8 degrees with fresh, gusty winds.
On Friday night, showers or rain or sleet will continue for a spell, but will become confined to Atlantic coastal counties later in the night.
There will be frost in many areas with lowest temperatures of -1 to 3 degrees.
Saturday morning will be mainly dry with sunny spells.
In the afternoon, rain will develop in the west and will spread eastwards through the evening.
Met Eireann added: "Sunday will be breezy with sunny spells and showers spreading from the west to all areas.
"The early days of next week will continue unsettled with further spells of rain or showers."
