A Status Yellow Snow And Ice Warning Is In Place For 18 Counties Conditions will also be wintry across Cork today
It covers all of Connacht, Donegal, Monaghan, Cavan, and all Leinster counties - except Wexford and Kilkenny - and is in place until 6 this evening.
The Coast Guard is warning people to stay away from the water as wet and windy conditions are expected.
A swimmer was rescued at Sandycove in Dublin yesterday morning, while a windsurfer was rescued off Garrylucas Strand in west Cork.
Irish Coast Guard spokesman Ger O Flynn says conditions are treacherous:
A Windsurfer Has Been Rescued Off The West Cork Coast
It happened shortly after 4pm yesterday afternoon.
The Courtmascsherry All Weather Lifeboat rushed to the scene as he was being blown out to sea.
The crew plucked him from the choppy seas onto the lifeboat, where he was wrapped in blankets and then brought him back safely to shore.
It comes after a was rescued by the Courtmacsherry Lifeboat and Coastguard 115 Helicopter after got into difficulty in Ring Harbour near Clonakilty on Friday evening.
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