Willemien Phelan from Met Éireann said that the fog cover will be slow to lift, expecially in a few midland and western areas.
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Herts and Essex can expect a foggy start to the weekend, according to a severe weather warning from the Met Office.
Visibility will fall below 100 metres in place, meaning that driving conditions will become hard.
The weather body has issued a yellow “be aware” alert, which applies from 1am to 11am on Saturday (Oct 3).
Friday night will be dry but cloudy, with mist and fog patches.
As a result the RSA is warning road users of the dangers of driving in heavy fog.
The biggest risk is of a multiple-vehicle pile-up on roads with higher speeds such as motorways and dual carriageways.
“If the fog closes in, reduce your speed further and take your time getting to your destination”.
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She added that vulnerable road users should do what they can to avoid, cycling or walking in fog.
