A status yellow wind warning has been issued for the entire provinces of Munster and Leinster, as well as Galway, with southwest to west winds expected to reach mean speeds of between 55 and 65 km/h, with gusts up to 110 km/h possible on Saturday afternoon and evening.
Separately, Met Éireann has issued a national snow-ice warning which will come into effect at midnight.
A calm Monday will be followed by four days of heavy rain and bitter wind as the temperatures plunge towards freezing.
"The showers will be most frequent in the west and north and will become more isolated this afternoon".
Temperatures plummeted to -2C overnight - with both the Gardaí and Road Safety Authority (RSA) warning that many areas would be at risk of compacted snow and black ice making driving surface very slippery.
Daytime temperatures only 1 to 4 degrees with a wind chill effect from a gusty west to northwest wind. Temperatures in the north will be 8C at their highest, with the south-west enjoying slightly higher temperatures of 12C. Frost and ice will form overnight.
Rain, wind, and more rain for Saturday and all through the night. Highest temperatures of 3 to 6 degrees with moderate westerly breezes.
Tuesday will be cold, with good sunny spells and some scattered wintry showers for a time. On Tuesday night, frost and ice will develop for a time.
Two other yellow alerts warn of strong winds as strong as 110km/h and heavy rainfall across the country.
Friday morning will be cold with frost and wintry showers, according to Met Éireann.