Last night Met Eireann issued a status yellow snow-ice warning for the entire country which will come into force later today.
Meteorologists at Ronaldsway say such showers are hard to predict, but that 10cm to 15cm of snow is possible over higher ground, with 2cm to 5cm in lower areas.
Earlier, Met Eireann warned that the cold air and some icy conditions coming tonight will be "a real shock to the system" after the mild period.
Ireland will be hit by strong winds today which will then give way to freezing cold weather tonight and tomorrow, with temperatures dipping as low as minus 2C in some parts accompanied with "accumulations of snow". Highest temperatures of 3 to 6 degrees are forecasted.
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There will also be icy stretches with north and northwest counties most at risk. High-sided vehicles and motorcyclists are particularly vulnerable to strong winds.
In Britain meanwhile, Storm Caroline is expected to bring very windy weather to northern Scotland.
The Met Office has warned of flying debris that could lead to injuries or danger to life, while damage to property is also possible.