Ireland's Hottest Summer 2025: 38°C Predicted by 2056 in New Model

Ireland's hottest summer on record was 2025, driven by very warm nights, despite daytime temperatures not matching the extremes of 1976 or 1995. Met Éireann noted that climate change is transforming previously unremarkable years into record-breaking ones as baseline conditions steadily rise.

The summer of 1976 was extraordinary for Ireland, featuring a 14-day heatwave with daily temperatures over 25 degrees, and was the driest summer in 150 years. In contrast, the longest recent heatwave was six days in 2023. Globally, temperatures are over 1.4 degrees above the 1850-1900 pre-industrial average, compared to just 0.27 degrees above in 1976.

New modeling by Professor Ed Hawkins (University of Reading, Co-Centre for Climate + Biodiversity + Water) and the UK Met Office projects that a 1976-like weather event in a warmer 2056 climate could see Irish temperatures exceed 38 degrees in June. This contrasts with Ireland's record high of 33.3 degrees in Kilkenny Castle in 1887 and 33 degrees in Dublin in 2022. Such extreme temperatures would have severe implications for infrastructure, health, and water availability.

Ireland is unlikely to meet its 2030 climate action target of a 51 percent reduction in greenhouse gas emissions, potentially achieving only half. Continued reliance on fossil fuels contributes to this. While global coordinated action and political leadership are essential, even with concerted efforts, the world will be at least 1.5 degrees above pre-industrial averages, making record-breaking summers regular. Adaptation to this new normal is crucial, as every fraction of a degree matters in mitigating extremes.