The mild start to the new year is set to be short lived with Met Éireann forecasting much colder weather this week.
Tomorrow, Monday will be bright and breezy at first with sunny spells and scattered showers developing, but southwesterly winds will become more moderate during the day.
Highest temperatures tomorrow will be between 7 and 10 degrees.
It will be dry for most of Tuesday and for daylight hours on Wednesday, but rain and showers are expected most days afterwards.
Tuesday will be noticeably colder than recent days with highest temperatures of just 3 to 6 degrees.
But there will be good spells of sunshine and light to moderate northwesterly winds.
Tuesday night will be dry at first with mostly clear skies.
Nationally, temperatures will be between -4 and 0 degrees with a widespread sharp frost developing in light to moderate westerly or variable breezes.
Wednesday will be cold and frosty to start with good sunny spells developing. Light outbreaks of rain will affect parts of the southwest for a time in the morning, but overall it will be a largely dry day with just some coastal showers.
Highest afternoon temperatures of 3 to 7 degrees are expected, in mostly light breezes.
During the evening, cloud will thicken from the west with rain following behind, extending eastwards across the country overnight along with freshening southerly winds.
The rain will be heavy in places with localised flooding possible. Lowest temperatures of -2 to +2 degrees are forecast.