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The coldest areas are found inland. Mullingar has the lowest average temperature, at 9.3 Â°C. The highest temperature ever recorded in Ireland was 33.3 Â°C at Kilkenny Castle, on 26 June 1887. The lowest temperature was -19.1 Â°C at Markree Castle on 16 January 1881. Although Ireland has no mountain-based meteorological station, it is almost certain its mountains have seen temperatures of -25 Â°C.
Dublin: Annual Weather Averages. July is the hottest month in Dublin with an average temperature of 16Â°C (60Â°F) and the coldest is January at 5Â°C (41Â°F) with the most daily sunshine hours at 6.3 in May.