Be careful out there this morning, as a Status Orange fog warning has been issued for all of Connacht and Leinster, and also for counties Cavan, Monaghan, Donegal, Cork, Limerick, Tipperary and Waterford.
The warning came into effect at midnight, and will remain in place until noon today.
Any lingering fog will clear as the afternoon goes on, giving way for sunny spells. Temperatures will reach 14C in places, lower in Ulster.