While it has subsided greatly overnight, Met Éireann have advised that caution is advised until 10am.
Another weather warning for fog has been issued by the Met Office today who say visibility is expected to fall below 100 metres in some places.
Friday night will be windy and very wet over the western half of the country, with heavy possibly thundery rain in many areas and some flooding.
The forecaster warns of travel disruption, power cuts and icy paths and roads in the area from Monday at 6pm until Tuesday at 11.55pm.
Drivers could experience poor visibility in parts of Cumbria this morning due to fog. Some bright or sunny spells where fog has cleared and especially in coastal counties. Top afternoon temperatures of 3° to 7° are given for the day.
The warning is in place between Monday 15th at 18:00 and Tuesday 16th at 23:55.
"Fog will thin slowly later on Thursday morning, although some patches may persist into the afternoon in the west of the warning area".
Temperatures will go below freezing tonight, although they are not expected to exceed -1C.
The bad weather will continue in to Friday, with strong winds and a spell of heavy rain expected.