Summer 2025 confirmed as Ireland’s hottest on record, says Met Éireann

This year and 1995 were the only two summers to date to surpass an average temperature of 16C for Ireland. Picture: Stephen Collins/Collins

Summer 2025 has been confirmed as Ireland’s hottest summer to date, beating a previous record dating back to 1995.

This year’s average temperature of 16.19C was 1.94C above the country’s long-term average (LTA) and marginally warmer (0.08C) when compared to the previous warmest summer of 1995. 

This year and 1995 were the only two summers to date to surpass an average temperature of 16C for Ireland.

August 2025 was the fourth-warmest August and ninth-warmest of any month in 126 years of records. The month had an average temperature of 16.83C, with the highest temperature of 28.1C recorded in Shannon Airport in Co Clare.

Met Éireann climatologist Paul Moore said: “Provisional Met Éireann data shows that summer 2025 is the warmest on record since 1900, when this temperature dataset began."

“It hasn’t been particularly sunny during summer, but the dry soils from a warm and sunny spring, the heat domes over mainland Europe, periods of high-pressure dominance, and the high sea surface temperatures around Ireland have kept temperatures over the last three months consistently above average — especially at nighttime. 

'Close call'

"It’s a close call with the previous record held by summer 1995, as summer 2025 average temperature surpasses 1995’s by only 0.08°C, even taking into account the temperature drop observed on the last week of August.” 

He said the role that climate change is having on the country's temperatures and in setting new records.

“The added heat in the system and the continuous background warming due to climate change, can now transform an unexceptional season into a record breaking one. 

"Ireland is experiencing the effects of climate change, and our climate projections show that our climate is going to become warmer. 2025 has already seen the warmest spring on record, and now summer 2025 is another example of the warming trend — making it the first year since 1933 with consecutive spring-summer records.”