Mount Dillion in Roscommon recorded the highest temperature in the country yesterday at 29.3 degrees.
Athenry in Galway recorded 29.5 degrees on Saturday afternoon, making it the hottest day of the year so far.
Temperatures could reach as high as 30 degrees in places this week as a national advisory for warm weather remains in place.
Met Eireann's high temperature advisory will run until Friday with very warm conditions forecast.
The highest temperature ever recorded in Ireland was 33 degrees in Kilkenny in 1887.