Temperatures are expected to be below average throughout the coming week with frost during some nights.
Met Éireann is forecasting overnight temperatures to drop as low as -3C on Monday into Tuesday with frost and icy stretches.
On Tuesday there will be some wintry showers with temperatures not getting above 8C.
The outlook for next weekend is for it to be colder than average with a northerly airflow feeding in showers, some of which may be wintry with an increased risk of hail and frost at night.
It comes as the country enjoys a short spell of fine weather with good dry spells today and plenty of sunshine for many areas.
It will remain mostly sunny in Leinster and Munster this afternoon, but cloud over Ulster and west Connacht will thicken and move southwards and to all areas by this evening.
Patchy light rain and drizzle will move into northern counties later this afternoon and evening.