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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.
4. Re: Weather in early October. Aug 21, 2010, 11:36 AM. Average day time temperatures in October are 14 degrees celsius in the day time and 9 degrees celsius at night. It could be colder and it's certainly likely to be wet. Weather in Ireland is changeable at any time of the year so layers are the best way to go - t-shirts, shirts, fleeces, waterproof jacket and shoes.