According to Met Eireann, fog - causing very poor visibility - will linger in many inland areas this afternoon and will become more extensive and dense this evening and, for a time, tonight.
This dense for will be accommpanied by some frost with lows overnight falling to -2.
James Madden, a forecaster for Exacta Weather, warned that snow will hit "northern and western areas" next week.
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Light winds will stop mists clearing leaving many parts of the country under a thick pea-soup through much of the day.
"Fog will be quite stubborn to shift and could still be an issue into tomorrow afternoon, there are some places where it won't clear all day".
The Met Office has issued a weather warning for heavy hail and snow in Dundee, Tayside and Fife next week.
The warning covers Northern Ireland, Wales, north-west England, south-east England, West Midlands, Yorkshire and Humber and south-east England.
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"This reduces the ability of the air to hold moisture, allowing condensation and fog to occur".
He said: "Fog is expected to become increasingly widespread through Wednesday evening and overnight into Thursday".
Thick fog will also cause travel chaos across the United Kingdom as commuters will face hard driving conditions and flight delays today. Lowest temperatures 4 to 8 C.
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