Basically, it's going to be cold.
Met Éireann has issued a nationwide Weather Advisory, and is warning of much colder spells for the rest of the week.
Weather Advisories are issued ahead of time to provide early information on potential hazardous weather.
The national forecaster says the country should prepare for 'sharp to severe' frosts in parts as well as wintery showers and icy stretches.
The warning is valid from 4pm tomorrow until 11:59pm on Friday.
Here's how things look:
Tonight: It'll be cloudy with scattered outbreaks of rain and drizzle sinking down from the northwest. Lowest temperatures of 4 to 7 degrees.
Wednesday: Some of the showers will be heavy with the risk of hail, especially across the western half of Ireland. Feeling cold in a fresh west to southwest breezes. Highest temperatures of only 5 to 8 degrees Celsius, coldest across Ulster. It'll be a cold night with lowest temperatures of -1 to +3 degrees.
Thursday: Very cold with widespread heavy showers or longer spells of rain and a risk of hail and thunder and some showers may turn wintry on high ground in the west. Temperatures will only reach between 3 and 5 degrees so feeling very cold.
Overnight, many areas will be dry with clear spells and a sharp ground frost leading to some icy patches. Lowest temperatures of -3 to +2 degrees, coldest in Ulster and Leinster.
Friday: Another cold day. Temperatures during the afternoon will only reach between 3 and 6 degrees.
However it won't be as cold as Thursday night with lowest temperatures of 0 to +4 degrees, but it will remain breezy with fresh to strong northwesterly winds.
