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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.
The July weather guide for Ireland shown below is for Dublin. Weather in Ireland in July. The average maximum daytime temperature in Ireland in July is a comfortable 19Â°C (66Â°F). There are usually 5 hours of bright sunshine each day, which represents 32% of the 16 hours of daylight. The average sea temperature in and around Ireland in July is 14Â°C (57Â°F). Expect 51mm (2.0 inches) of rainfall across the whole of July with 14 days with some rain falling. Maximum UV levels will be high (6 UV index) at midday when the skies are clear. The average night-time temperature is usually a cool 12Â°C (54Â°F).