Forecasters predict "a mixed bag" of weather over the coming week, with sunny spells and the possibility of rain.
At 27 degrees, Saturday was the warmest day of the year so far, said Mr Michael Cleary, a forecaster with Met Eireann, but this temperature is unlikely to be equalled this week. "It won't be fine all the time. There will be some rain." Despite some reports, Mr Cleary said there is "nothing on the charts to suggest a heat wave" is currently taking place. On Saturday, the hottest parts of the State were in Leinster, with stations in Dublin Airport and Kilkenny measuring a temperature of 27 degrees.
A band of cloud came across the State yesterday, interrupting the sunshine. In the coming days, weather from the Atlantic will bring rain, with the west receiving most of it, he said.
Met Eireann's website said the coming days would continue to be warm, humid and mainly dry, but cloud could lead to rain. Tuesday and Wednesday will be "mostly dry, but a good deal of cloud is likely, which may bring a little patchy rain or drizzle at times".
"Winds will be light to moderate, from a westerly or variable direction and it will be quite warm and humid. Thursday will be mostly cloudy, with some showery rain possible".
Today's weather is predicted to contain some bright or sunny spells, mostly in midland and eastern areas. It will be "rather cloudy elsewhere with a little rain or drizzle, mainly near Atlantic coasts. Rain will become more widespread in western and northern areas during the afternoon and evening". Highest temperatures are likely to be 18 to 23 degrees.
Weather reports on the website yesterday afternoon showed Kilkenny had the highest temperature at 23 degrees. Ulster, Munster, and Connacht forecasts indicate it will be dry and warm. Dublin, and the Leinster area, are predicted to be mainly dry, with sunny spells.