Temperatures across the country reached the high 20s, with Met Éireann forecasting that the spell of good weather will be short-lived as rain moves in over the coming days.
Met Éireann had earlier said that today was likely to be the hottest day of the year, with temperatures forecast at one point to reach as high as 28 Celsius .
However, it said that temperatures would be brought down with some cloud and the arrival of thunderstorms in some areas.
A high of 26C was recorded at Oak Park in Carlow this afternoon, while temperatures reached 25C at Phoenix Park and at Casement Aerodrome in Dublin.
The highest temperature of the year so far was 27.1C earlier this month.
The spell of good weather will not last however, as rain moves in over the coming days.
Met Éireann is forecasting isolated heavy showers tomorrow morning, with persistent rain spreading across many areas by the afternoon.
The rain will continue through tomorrow night, with some heavy and possibly thundery bursts possible.
Saturday will see frequent showers with some turning heavy, especially in parts of the north and northeast.
The rain will continue through to Sunday, with the best of the dry and bright weather in the south and east of the country.
Met Éireann has warned the hot weather could lead to severe thunderstorms and localised flooding.
The forecaster has issued a Status Yellow Thunder warning for the entire country. The warning is in place from 4pm this afternoon until 9am tomorrow morning.
Heavy thunderstorms are expected to develop later, with some severe downpours, hail and spot flooding.
Some parts of the country will remain dry due to the localised nature of the thunderstorms.
Continuing very warm&humid this evening with spells of hazy sunshine&light breezes. Most areas will remain dry but a few thunderstorms will break out later this eve. Humid&increasingly cloudy tnt with scattered thunderstorms moving northwards over the country.Lows of 12 to 15°C. pic.twitter.com/kGsvp7q8Gg— Met Éireann (@MetEireann) June 25, 2020