Weather in Ireland
Ireland’s weather is notoriously variable, so providing charts with temperature averages can be a bit tricky. In general, you can expect warm weather (often with high humidity) during the height of summer, occasionally interrupted by thunder storms, and cloudy and rainy weather during the winter. Snow falls in the mountains, but rarely in the cities and towns at lower elevations. Even in winter there are sunny days. The shoulder seasons of spring and autumn are even more unpredictable, as you can experience a bit of everything in very short periods of time.
Having said that temperature averages can be tricky, here are a few charts which show the averages for several points around the country. These are 30-year averages, and the “average wet days” is days with rainfall measuring more than one millimeter.
Dublin (eastern Ireland)
| Month | Average High (F) | Average Low (F) | Average High (C) | Average Low (C) | Average Wet Days |
| January | 45.7 | 36.5 | 7.6 | 2.5 | 13 |
| February | 45.5 | 36.5 | 7.5 | 2.5 | 10 |
| March | 49.1 | 37.6 | 9.5 | 3.1 | 11 |
| April | 52.5 | 39.9 | 11.4 | 4.4 | 10 |
| May | 57.6 | 44.2 | 14.2 | 6.8 | 11 |
| June | 63 | 49.3 | 17.2 | 9.6 | 10 |
| July | 66 | 52.5 | 18.9 | 11.4 | 9 |
| August | 65.5 | 52 | 18.6 | 11.1 | 11 |
| September | 61.9 | 49.3 | 16.6 | 9.6 | 10 |
| October | 56.7 | 45.7 | 13.7 | 7.6 | 11 |
| November | 49.6 | 39.6 | 9.8 | 4.2 | 11 |
| December | 47.1 | 38.1 | 8.4 | 3.4 | 12 |
Cork (southern Ireland)
| Month | Average High (F) | Average Low (F) | Average High (C) | Average Low (C) | Average Wet Days |
| January | 45.7 | 36.7 | 7.6 | 2.6 | 16 |
| February | 45.5 | 36.5 | 7.5 | 2.5 | 13 |
| March | 48.7 | 37.6 | 9.3 | 3.1 | 13 |
| April | 48.7 | 39.6 | 11.3 | 4.2 | 10 |
| May | 56.8 | 43.7 | 13.8 | 6.5 | 12 |
| June | 61.9 | 48.6 | 16.6 | 9.2 | 10 |
| July | 65.3 | 52 | 18.5 | 11.1 | 9 |
| August | 64.8 | 51.6 | 18.2 | 10.9 | 11 |
| September | 60.8 | 48.9 | 16 | 9.4 | 12 |
| October | 55.6 | 45.5 | 13.1 | 7.5 | 15 |
| November | 49.8 | 40.1 | 9.9 | 4.5 | 14 |
| December | 47.3 | 38.7 | 8.5 | 3.7 | 16 |
Claremorris (western Ireland)
| Month | Average High (F) | Average Low (F) | Average High (C) | Average Low (C) | Average Wet Days |
| January | 45 | 34.5 | 7.2 | 1.4 | 18 |
| February | 45.7 | 34.3 | 7.6 | 1.3 | 14 |
| March | 49.3 | 36.1 | 9.6 | 2.3 | 17 |
| April | 53.6 | 37.9 | 12 | 3.3 | 12 |
| May | 58.1 | 42 | 14.5 | 5.5 | 14 |
| June | 62.6 | 47.8 | 17 | 8.2 | 12 |
| July | 65.1 | 50.4 | 18.4 | 10.2 | 11 |
| August | 64.8 | 49.6 | 18.2 | 9.8 | 14 |
| September | 61 | 46.6 | 16.1 | 8.1 | 15 |
| October | 55.8 | 43.34 | 13.2 | 6.3 | 17 |
| November | 49.1 | 37.4 | 9.5 | 3 | 17 |
| December | 46.2 | 36.1 | 7.9 | 2.3 | 17 |
Shannon (southwestern Ireland)
| Month | Average High (F) | Average Low (F) | Average High (C) | Average Low (C) | Average Wet Days |
| January | 46.8 | 36.7 | 8.2 | 2.6 | 16 |
| February | 47.3 | 36.9 | 8.5 | 2.7 | 12 |
| March | 50.9 | 38.5 | 10.5 | 3.6 | 14 |
| April | 54.9 | 40.6 | 12.7 | 4.8 | 11 |
| May | 59.5 | 45.1 | 15.3 | 7.3 | 13 |
| June | 64.2 | 50.2 | 17.9 | 10.1 | 11 |
| July | 66.9 | 53.6 | 19.4 | 12 | 10 |
| August | 66.6 | 53.1 | 19.2 | 11.7 | 13 |
| September | 63 | 50.2 | 17.2 | 10.1 | 13 |
| October | 57.6 | 46.4 | 14.2 | 8.0 | 15 |
| November | 50.7 | 40.1 | 10.4 | 4.5 | 15 |
| December | 48 | 38.5 | 8.9 | 3.6 | 16 |
More details, and more weather charts, are on the official Irish National Meteorological Service website.
Also see our post about when to visit Ireland.