Today has been the hottest day of the year so far and hottest day in Ireland for three years, with Met Éireann recording a temperature of 29.6C in Co Roscommon this afternoon.
The temperature was recorded at Mount Dillon, which yesterday also saw highs of 27C.
The forecaster said today's figure marks the highest temperature since August 2022.
Following a hot day with long spells of sunshine, Met Éireann said tonight will be mild and humid with temperatures around 12-17C.
It comes as warnings are being reiterated for people to stay safe in the sun and water during the current hot spell.
As many flock to the country's coastline and waterways, officials have urged those enjoying the sunshine to do so safely.
Beach lifeguards are not on duty today so sea swimmers are advised to take extra care in the water.
Met Éireann said the current spell of fine weather will be short-lived so the message is to get out and make the most of it, if you have the chance.
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Meanwhile, temperatures in the UK are expected to rise to 33C this weekend, with human-caused climate change blamed for increasing the chances of such extreme heat.
According to a study from the World Weather Attribution (WWA) group at Imperial College London, the UK heatwave will be about two to four degrees hotter as a direct result of climate change.
WWA also found that June heatwaves, with three consecutive days of temperatures above 28C, are about ten times more likely compared to the cooler preindustrial climate, before humans burned fossil fuels.
In its rapid-study, the group of climate scientists said that human-caused climate change will make tomorrow's widespread heat of 32C in southeast England about 100 times more likely.
Amber health alert in UK
An amber health alert was issued for the whole of England yesterday, as the UK recorded its hottest day of 2025.
The alert was issued by the UK Health Security Agency (UKHSA) for the first time since September 2023 and is in force until 9am on Monday.
It warns "significant impacts are likely" across health services because of high temperatures, including a rise in deaths - particularly among those aged 65 and over or people with health conditions.
Dr Ben Clarke, Researcher at the Centre for Environmental Policy Imperial College London, said that as the world gets warmer the chances of more heatwaves also increases.
"This heatwave is another reminder that our planet has already heated to a dangerous level. We're at 1.3°C today, but heading for around 3°C this century. With every fraction of a degree of warming, the UK will experience hotter, more dangerous heatwaves," he said.
World Weather Attribution conducted a large study in 2022 after temperatures in the UK exceeded 40C.
Using evidence from that study, combined with other available data sets and models, the scientific group was able to issue this "rapid-study".
The 2022 study had concluded that the 40.3C recorded in England in 2022 was "almost impossible" without human-induced climate change.
