Photo: MaxPride · CC BY-SA 4.0Few Irish towns have cooler summers than Loch An Iúir
The coldest hours of a January night bottom out at 2.9°C on average. Its yearly rainfall tops that of almost every Irish town. Warming shows here too: 0.2°C more than in 1981–2010, led by February. Central heating does most of its work from November to April, in months below 10°C on average.
Met Éireann 1991–2020 averages for the town’s own square kilometre.
A year in Loch An Iúir at a glance
Each month’s typical high and low, in °C.
What stands out about Loch An Iúir’s climate
Compared with Irish towns, with its place among towns of 2,500+ in County Donegal beside it.
What a year in Loch An Iúir feels like
Typical highs and lows by season and by month, from Met Éireann’s 1991–2020 averages.
About 1,596 mm of rain a year
November is the wettest month and May the driest. The wettest of 7 towns of 2,500+ in County Donegal. The wettest month brings about 2.0 times the rain of the driest.
Rain by month
Millimetres
Living with Loch An Iúir’s climate
What the averages mean for a garden, a free afternoon and a bad-weather day.
Highs of 17–27°C with lows of 8°C or more: Jul and Aug.
Parks & trails →Averages smooth over storms, floods and heatwaves; Loch An Iúir’s hazards page covers the risks.
Flood & hazards →Met Éireann’s nearest station: Finner
Finner is 57 km south of Loch An Iúir, the nearest of the 25 synoptic stations where Met Éireann records the weather around the clock.
| Distance from the town | 57 km south |
| Station altitude | 33 m |
| Town altitude (its centre) | 38 m |
The figures on this page are not this station’s readings: they are Met Éireann’s 1 km grid at Loch An Iúir itself, which it builds from its whole network of stations.
How Loch An Iúir compares
Against the 321 Irish towns and city neighbourhoods of 2,500 or more, each read from Met Éireann’s grid at its own centre, and its place among towns of 2,500+ in County Donegal.
Warmer than it used to be
Loch An Iúir’s 1991–2020 average is 0.2°C warmer than 1981–2010’s. The biggest change is in February (+0.4°C).
A year’s rain is 1,596 mm, up 3% from 1,543 mm.
Change by month
The two periods share 1991–2010, so the gap is a decade’s step, not the change between two separate 30-year periods.
Nearby towns’ climate
The nearest towns of 1,000+ within 19 km: a hill, a valley or the sea can make a real difference over a short distance.
| Town | July high | January low | Rain a year |
|---|---|---|---|
| Loch An Iúir | 17.9°C | 2.9°C | 1,596 mm |
| An Clochán Liath 8.0 km | 17.9°C about the same | 3.0°C about the same | 1,454 mm |
Loch An Iúir weather by month
Average daily high and low, mean temperature and rain, 1991–2020, for the town itself (Met Éireann’s 1 km grid).
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 8.1°C | 2.9°C | 5.5°C | 163 mm |
| February | 8.5°C | 2.9°C | 5.7°C | 133 mm |
| March | 9.8°C | 3.8°C | 6.8°C | 113 mm |
| April | 12.2°C | 5.2°C | 8.7°C | 90 mm |
| May | 14.8°C | 7.3°C | 11.1°C | 89 mm |
| June | 16.8°C | 9.8°C | 13.3°C | 100 mm |
| July | 17.9°C | 11.5°C | 14.7°C | 130 mm |
| August | 17.9°C | 11.6°C | 14.7°C | 137 mm |
| September | 16.3°C | 10.0°C | 13.1°C | 132 mm |
| October | 13.2°C | 7.7°C | 10.4°C | 162 mm |
| November | 10.4°C | 5.2°C | 7.8°C | 177 mm |
| December | 8.5°C | 3.3°C | 5.9°C | 169 mm |
| Year | 12.9°C | 6.8°C | 9.8°C | 1,596 mm |
Where Loch An Iúir’s numbers come from
Averages over 30 years, not a forecast.
- Temperature and rain: Met Éireann’s 1991–2020 averages on its 1 km grid (Climatological Notes 22 and 23), read at the grid point nearest Loch An Iúir’s population centre (0.4 km away).
- Weather station: the nearest of Met Éireann’s 25 synoptic stations, Finner, 57 km south, from Met Éireann’s station list.
- Frosts and degree days: Finner’s daily readings, 2011–2020, in the station table only: past 40 km they don’t stand for the town.
- Then and now: Met Éireann’s 1981–2010 averages on the same 1 km grid, at the same point.
- Altitudes: the town’s ground from the Copernicus GLO-30 surface model (a few metres high in built-up places), the station’s from Met Éireann.
- Comparisons: every Irish town and city neighbourhood of 2,500 or more, read the same way; the five city totals are left out.
- Not on this page: sunshine, frost days, warm days, snow and wind. Met Éireann publishes no 1991–2020 grid for them, only tables for its stations, so no town has a figure of its own.
Met Éireann 30-year averages · Met Éireann open data. Under Creative Commons Attribution 4.0 (CC BY 4.0).
Questions about Loch An Iúir’s climate
How warm does Loch An Iúir get in summer?
July is the warmest month, with average highs of 17.9°C.
How cold does Loch An Iúir get in winter?
The coldest nights come in January, averaging 2.9°C. Met Éireann counts frosts only at its weather stations, so there is no frost count for the town itself.
How much rain does Loch An Iúir get?
About 1,596 mm a year, more than almost every Irish town. November is the wettest month (177 mm) and May the driest (89 mm).
How sunny is it?
Met Éireann publishes its 1991–2020 sunshine averages for its weather stations only, not on the 1 km grid this page reads, so there is no sunshine figure for Loch An Iúir itself. Its nearest synoptic station is Finner.
Are these figures for Loch An Iúir itself?
Yes: they are Met Éireann’s 1991–2020 averages on its 1 km grid, read at Loch An Iúir’s population centre. The nearest of its synoptic weather stations, Finner, is 57 km south.
Where do these figures come from?
Met Éireann’s 1991–2020 climate averages, published as maps of Ireland in 1 km squares (Climatological Notes 22 and 23); the page reads the square at Loch An Iúir’s population centre. They are 30-year averages, not a forecast.
Copyright Met Éireann. Source: www.met.ie. This data is published under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Met Éireann does not accept any liability whatsoever for any error or omission in the data, their availability, or for any loss or damage arising from their use. This material has been modified from the original: TownRatings reads the 1 km grid at each town’s population centre. Today’s forecast for Loch An Iúir →
Contains Central Statistics Office (CSO) data, Census 2022, and Tailte Éireann boundaries (CSO Urban Areas, Small Areas, local electoral areas, constituencies), under Creative Commons Attribution 4.0 (CC BY 4.0).