The Met Office has issued a yellow "be aware" warning that states snow showers will be heaviest and most frequent across the Western Isles and Highlands on Monday through to Tuesday.
Visibility less than 100m in places.
Thick fog will also cause travel chaos across the United Kingdom as commuters will face hard driving conditions and flight delays today.
Up to 2in of snow could fall at lower levels, with up to 4in predicted in areas above 656ft.
The has issued an urgent yellow warning and said some flights could be delayed because of patchy fog on Friday night.
Forecaster Helen Roberts said: "Mists will quickly develop tonight turning readily into fog, mostly across western areas".
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He said: 'We are currently in the calm before the storm, there are now strong signals for a potent wintry blast to arrive early next week.
While Limerick city and county is now enduring dense fog at present, Met Eireann expects this to worsen between Thursday evening and the early hours of Friday morning.
Despite a switch to a more westerly airflow it will feel cold especially across the north where the odd flake of snow is possible, according to Exacta Weather's James Madden.
Meanwhile, motorists have been advised to allocate more time for their journeys this morning.
Wrexham is again covered in the weather warning, which is the second to be issued in two days.