Dramatic change after heatwave as rain and even snow move in
Prepare to get out the hats and scarves, because while May is on the way it will feel more like winter.
Few people might have expected to be talking about frost and snow after last week's mini-heatwave - but that is exactly what is on the way.
The hottest day of the year occurred last Thursday, when temperatures reached 21C.
However, forecasters say a dramatic change has taken hold.
Today's temperatures will drop and reach just 7C in the north of the country, while the rest of the island is expected to get no warmer than 12C.
Night-time temperatures this week will regularly plunge below freezing.
In mountain areas along the west coast sleet and snow are expected to fall this morning and it could spread to higher ground in other parts of the country as the day goes on. The cooler air means the likelihood of thunder storms is high, while most areas will be pelted with hail.
"It is going to be very cool as a north-westerly wind makes its way through the country," Gerry Murphy of Met Éireann said. "There will be significant showers overnight and into tomorrow, which will likely bring on hail and some thundery conditions in places."
Temperatures last night were as low as -2C in some places.
Gusty winds will come into force on Tuesday, bringing with it a spell of wet weather that will sweep in from the Atlantic overnight.
It will be another cold and fairly breezy day, with a mixture of bright spells and showers, with temperatures ranging from a chilly 1C to 8C.
Average daily temperatures this week will range from 9C to 10C, while Wednesday will be the worst day for rain and wintery conditions.
It will stay cool and cloudy, but the rain is expected over Leinster and eastern parts of Munster.
"On Wednesday there will be a band of much heavier rain," Mr Murphy said.
Met Éireann have said that temperatures recorded last week were "above average" for the time of the year, while this week they will be "below average".
There is some hope for next weekend though, as by Thursday the wettest weather will subside.