Wrap up warmly as temperatures are set to plummet as low as -4C tonight.
According to Met Eireann forecaster Joanna Donnelly, freezing temperatures will see icy stretches on untreated surfaces.
"Very cold temperatures will be due to the lack of cloud cover and high pressure with clear skies," she told the Herald.
"This will see temperatures drop to -4C at their lowest and it'll stay cold throughout the weekend."
Today, there will be highs of 4-7C throughout the day, with fog early in the morning.
This afternoon will be dry and sunny as the fog will clear off.
The frost will once again return tonight.
However, no snow is expected as it is predicted to remain dry.
"It'll be dry and sunny again with light winds on Sunday and fog in the morning, which will clear off throughout the day," added Ms Donnelly.
Temperatures will reach highs of 4C to 9C, with it remaining coldest across Ulster and north Leinster.
The cold snap will end tomorrow night, with cloud cover on Monday helping temperatures rise slightly.
Temperatures on Monday will range from 7C to 10C and, with the frost, local fog and rain will make a return on Tuesday.