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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.
Guide to Ireland weather in May The average maximum daytime temperature in Ireland in May is a comfortable 15Â°C (59Â°F). The average night-time temperature is usually a cold 7Â°C (45Â°F). There are usually 6 hours of bright sunshine each day, which represents 38% of the 16 hours of daylight.