The midlands,west and southwest look set to see the warmest temperatures although the mercury is expected to peak around 15 or 16 degrees in Dublin, making the capital significantly warmer than Sunday.
Temperatures rocketed to a sizzling 18.8 degrees at Shannon Airport yesterday, with highs of 18.3 recorded at Mount Dillon in Co Roscommon and 18.6 at Mace Head in Galway.
But it was decidedly cooler in the east, despite bright sunshine for much of the day.
The mercury reached just 11.7 degrees in Phoenix Park in Dublin and 11.6 at Casement Aerodrome, according to Met Eireann data.
Forecasters have revealed we're in for more pleasant conditions today after mist in places early this morning.
A Met Eireann forecaster said: "Today will be mainly dry with hazy sunshine. It will become cloudier over Ulster with light rain or drizzle developing in the north towards evening and extending over Ulster and north Connacht by nightfall. Highest temperatures 14 to 17 degrees with light variable or northwest breezes."
The midlands, west and southwest look set to see the warmest temperatures although the mercury is expected to peak around 15 or 16 degrees in Dublin, making the capital significantly warmer than Sunday.
However, it won't last long as meteorologists warned of "widespread showers" tomorrow with a risk of hail and thunder.
Scattered showers will hit Ulster and Connacht first before moving southwards and becoming widespread in the afternoon. Some will be heavy and of hail while a few could turn thundery. It will be much cooler with highs of just of 10 to 13 degrees and moderate north to northwest breezes.
Wednesday will see similar temperatures with sunny spells and scattered showers, these mainly in Ulster, Leinster and north Connacht. Munster will be spared the rain for the most part.
And we're in for some cold nights from mid-week, with lows of 0 to four degrees on Wednesday and Thursday, with even frost in places on Thursday night.
Met Eireann revealed the outlook for the week is for cool conditions with mainly northerly winds, sunshine and showers and frost in many areas at night.