A bitterly cold start to the week will lead to "hazardous driving conditions" in parts of Ireland.
Temperatures dropped to -3C overnight, which has resulted in frost and fog patches on Monday morning.
However, Met Eireann says the frost and fog will clear gradually. Monday will see a mix of cloud and sun, with highs of up to 8C.
A forecaster said: "Frost and fog with some freezing fog patches will lead to hazardous driving conditions in parts of the country this morning.
"The frost and fog will gradually clear during the day to leave it dry with a mix of cloud and sunny spells.
"Highest afternoon temperatures of 5 to 8 degrees in light breezes which will vary in direction."
The country will be gripped by "widespread frost" on Monday night.
Temperatures are set to plunge to as low as -2C, but cloud from the Atlantic may limit the frosty weather in the west.
The forecaster said: "Dry and clear in most areas overnight with a fairly widespread frost.
"However, there will be more in the way of cloud in Atlantic coastal areas which will restrict a frost from developing there.
"Minimum temperatures of -2 to +4 degrees in mostly light southerly breezes, increasing moderate along Atlantic coasts."
