Sweltering temperatures are set to continue today but there is a big change on the way later this week, Met Eireann has warned.
The unseasonably mild conditions of the Easter weekend will remain on Tuesday, with highs of up to 21C expected in some places.
However this period of good weather is set to come to an end, as some frost and freezing overnight temperatures are predicted on Friday.
Parts of the country will also be battered by heavy and thundery rain on Wednesday and Thursday, as temperatures return to around the average for the time of year.
The forecast for Tuesday reads: "Mostly cloudy and misty at first with some showers.
"Brightening up later this morning and for the afternoon with any showers becoming confined to the Northwest.
"Hazy sunshine developing and becoming warm with top temperatures of 17 to 21C in moderate East to Southeast or variable breezes.
"Tonight will be mild, humid and misty with further showers moving up over the country from the southeast.
"Minima of 8 to 11 degrees in mainly moderate east to southeast breezes, becoming fresher along the Northeast coast."
Conditions will start to turn more unsettled tomorrow, as a spell of heavy rain batters the south coast, with temperatures dipping to freezing on Friday night.
A forecaster added: "Tomorrow will bring bands of heavy/thundery showers or rain spreading up from the South. Good dry bright periods likely until later in the North.
"Moderate or fresh Southeast or Southerly breezes.
"Highest temperatures ranging from the high teens in the Midlands and North to 14 or 15C in the South but turning cooler everywhere later.
"Further showers will occur on Wednesday night, some of them heavy and possibly thundery.
"Lows of 5 to 7C in light to moderate east to southeast winds, which will be fresh to strong along the south coast.
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"Turning cooler and windy at times on Friday with further heavy rain or showers but some drier and brighter interludes too.
"Maximum temperatures trending near to slightly below average for the time of year with maximum temperatures ranging from around 9 to 12C.
"Nights will be cold with temperatures between 0 and 3C giving a touch of grass frost."
