4th warmest June despite the rain

After a cool start, June 2025 has become the 4th warmest on record for Ireland, with all stations recording mean temperatures above their Long Term Average. Mount Dillon, Co Roscommon, recorded the maximum temperature of the year so far, 29.6°C on Friday 20th June. Most stations saw rainfall above average, making this June the 24th wettest since 1941.

The average temperature for June 2025 was 15.10 °C, making it the 4th warmest June on record since 1900. Of the top ten warmest Junes, five have occurred recently (2023, 2018, 2025, 2010 and 2006). The warmest June was in 2023 with an average temperature of 16.22 °C and the coldest June was in 1972 with an average temperature of 12.68 °C.

June 2025 was notably warmer than average, continuing the recent warmer-than-normal monthly trend. June 2025 was the 4th consecutive month with temperatures in the respective top 8 averages on record in 126 years of records.

The average temperature for June 2025 was 1.88 °C above the 1961-1991 long-term average for the month and 1.42 °C above the long-term average for the most recent climatological reference period of 1991-2020.

Provisional gridded rainfall data suggests June 2025 averaged around 100 mm, which is 117% of the month’s long-term average from 1991-2020.

The final third of the month has been remarkably hot for Europe, when an intense area of high pressure built over mainland Europe, provoking heatwave conditions to develop over it. While this happened over mainland Europe, Ireland stayed on the cloudier northern edge of the heat dome, which brought some uncomfortably high nighttime temperatures, contributing to the high June temperatures overall.