Met Eireann has forecasted a 17C swing as a cold night on Tuesday will give way to a glorious St Patrick's Day.
There will be some frost in places on Tuesday with lows of 0C, but temperatures are set to soar, particularly in the south, with highs of 17C expected on Wednesday.
And there is even some hope for "BBQ weather" on the big day itself, with plenty of sunshine across the country.
A high pressure system is also set to firmly establish itself here over the coming days, which will keep conditions dry albeit somewhat cloudy at times.
Expert Alan O'Reilly from Carlow Weather explained: "It won’t be all sunshine and blue skies but it won’t be wet either. High pressure is coming and it might be slow to leave.
"Not only does the High Pressure keep the rain away but it also keeps the strong winds away. Which is good news for most but maybe not the renewable power.
"So the question is, does 15c, sunshine and light winds justify getting the BBQ cleaned for Saint Patrick’s Day?"
Meanwhile, Tuesay will be mild with highs of 16C, warmer in the south.
A Met Eireann forecaster said: "Residual cloud, drizzle and mist from overnight will clear southwards later this morning, with dry and sunny conditions extending from the northwest to all parts. Maximum temperatures will range 13 to 16 degrees generally, mildest near the south coast, but a cool onshore northwest breeze will cap temperatures at 10 to 12 degrees in parts of the north and northwest.
"Turning cold tonight under mostly clear skies with some mist and fog patches forming in the near calm conditions. Minimum temperatures of 0 to +3 degrees, with a touch of frost.
"Frost, mist and fog will clear on Wednesday morning, giving way to a largely dry St. Patrick's Day with plenty of sunny spells. Cloud will advance into western and northern counties later in the day, however, with some patchy drizzle possible. Maximum temperatures will range from 10 or 11 degrees on the north coast up to 16 or 17 degrees in south Munster and south Leinster. Winds will be light, northwest or variable in direction.
"Cloud will spread southwards over the country on Wednesday night with a few patches of drizzle possible. Minimum temperatures of 5 to 8 degrees in light northwesterly breezes. Some mist and fog patches will also occur."
And from Thursday onwards it will stay dry and settled as a high pressure system continues to "dominate" our weather, but experts did warn that it will turn cloudier.
A forecaster added: "Thursday will start out dull and misty with some light drizzle in places. Mainly cloudy conditions will persist throughout the day but it will become drier by the afternoon as the mist clears and the patches of drizzle become more isolated. Top temperatures will range 10 to 13 degrees in mainly light, occasionally moderate northwesterly breezes.
"Patchy drizzle will continue overnight but it will be dry for most with some breaks in the cloud. Lows of 6 to 9 degrees with mist and some fog forming in light, occasionally moderate, northerly breezes.
"Friday will be a cloudy day in many areas, with a little patchy drizzle, mainly in the northwest. Some bright or sunny breaks will occur at times too though, with the best chance of these over southern parts of the country.
"Top temperatures will range 9 to 12 degrees where mostly cloudy conditions prevail, but up 13 or 14 degrees where sunshine breaks through. Light north to northeast breezes. Mostly cloudy on Friday night with just a few spots of light drizzle, mainly on hills and coasts. Lows of 5 to 8 degrees with mist and fog patches forming in light northerly or variable breezes.
"Saturday will be another largely dry but predominantly cloudy day although some limited bright or sunny breaks may occur. The cloud may be thick enough to produce a few spots of drizzle, mainly on hills and coasts. Highs of 9 to 12 degrees in light northwest or variable breezes.
"It looks as though cloud may start to thin out on Saturday night to produce some clear breaks. Lows of 3 to 6 degrees. Some mist and fog patches may form in the light west to northwest breezes.
"Current indications for Sunday suggest a brighter day with more in the way of sunshine than the preceding days. It may be quite cloudy to begin with patchy light rain or drizzle in Ulster and some early mist and fog patches, but sunny spells look set to break through in many places by the afternoon. Maximum temperatures 10 to 13 degrees in light to moderate westerly breezes."
