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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.
1 The average temperature in Dublin in July is mild at 15 Â°C (59 Â°F). 2  Afternoons can be somewhat warm with average high temperatures reaching 18.9 Â°C (66 Â°F). 3  Overnight temperatures are generally quite mild with an average low of 11.4 Â°C (52.5 Â°F).  The mean diurnal temperature variation/ range in July is 7.5 Â°C (13.5 Â°F).