Mount Dillon in County Roscommon was the warmest area in the country this morning.
As of 10am, the mercury reached 21 degrees, with Met Eireann forecasting highs of up to 25 degrees this afternoon in Connacht, while the south and the east of the country are expected to see the best conditions.
Mayo enjoyed the hottest temperatures in the country yesterday.
For the Bank Holiday Monday, Newport Furnace weather station recorded the highest temperature of over 27 degrees.
Athenry in Co Galway, Mount Dillon in Roscommon and Claremorris in Co Mayo all enjoyed over 26 degrees of sunshine, with 24.3 degrees recorded at Knock Airport.
However, the second half of the week is expected to be cooler and blustery.