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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.
Average Temperatures in Dublin, Ireland. 1  The mean temperature in Dublin, Ireland is a little cool at 9.5 degrees Celsius (49.1 degrees Fahrenheit). 2  Mean monthly temperatures have a variation of 10 C (18 F) which is a low range. 3  There is a range/ variation of diurnal average temperatures of 6.4 C (11.6 F).