Letterkenny weather
Loading live data…Light drizzle,rain likely tomorrow
Met Office, the European and the American model agree on a high near 17° in Letterkenny today. Tomorrow: light drizzle, around 16°, with a 100% chance of rain.
Latest for Letterkenny: Met Office (UKMO model): 17° Light drizzle · European (ECMWF): 16° Light drizzle · American (NOAA GFS): 16° Overcast.
CheckWeather.io on iPhoneFree. No ads, no account.Letterkenny weather in numbers
from 30 years of measured normalsLetterkenny swings 15°C across the year, from 17°C highs in June to 2°C lows in February, and January is usually the wettest month in a year that brings about 1345 mm of precipitation.
The weather map: all three models at once
Met Office, European, American side by side around Letterkenny and nearby towns.Live rain radar →Letterkenny hourly forecast: next 14 hours
consensus of the three modelsRain in the next 24 hours, model by model
each model's own hourly precipitation, side by sideLoading the three models…
Letterkenny 10-day forecast, out to 14 days
where the models agree, and where they splitLetterkenny, Co. Donegal. Below we compare what Met Office, European, American forecast for Letterkenny right now and flag exactly where they disagree, then break down Letterkenny's weather month by month and which forecast model has been most accurate here.
We grade every model against the weather that actually happened, so you can see which forecast model is most accurate in Ireland before you trust any single number.
Letterkenny weather by month
what to expect in Letterkenny through the year, 1991-2020 averagesHere is Letterkenny's typical weather in each month: the average daytime high and overnight low in °C, how each month feels, and the wettest month marked. Use it to plan any trip to Letterkenny by season.
What Letterkenny's weather is like through the year
Letterkenny runs from warm summers, with June highs near 17°C, to cool winters, when February lows sit around 2°C (a swing of about 15°C across the year). January is usually the wettest month, and Letterkenny sees roughly 1345 mm of precipitation annually.
Best time to visit Letterkenny
The most comfortable time to visit Letterkenny is usually June, July, August and September, when daytime highs sit in the pleasant 16-26°C range and the heaviest January rain is behind you.
How Letterkenny's weather has changed since 1995
30 years of daily data, 1995-2024, shown as changeAround Letterkenny, the difference between 1995-2004 and 2015-2024 is +0.2°C, within the normal swing from year to year.
Frost nights
2015-2024 against 1995-2004, below 0°C. Within the normal year-to-year swing
Average wind
2015-2024 against 1995-2004. Within the normal year-to-year swing
Bars: each year against the area's 30-year average. Dashed lines: the average of the first and the last ten years.
See the numbers year by year
| Year | Temp vs average | Frost nights vs avg | Wind vs avg |
|---|---|---|---|
| 1995 | −0.1°C | +10 | +3% |
| 1996 | −0.8°C | +12 | −2% |
| 1997 | +0.3°C | +1 | −2% |
| 1998 | ±0.0°C | −0 | +6% |
| 1999 | ±0.0°C | −7 | +6% |
| 2000 | −0.3°C | −1 | +1% |
| 2001 | −0.5°C | +11 | −5% |
| 2002 | ±0.0°C | −7 | +3% |
| 2003 | +0.2°C | +1 | −2% |
| 2004 | +0.1°C | −3 | +3% |
| 2005 | +0.3°C | −7 | +3% |
| 2006 | +0.3°C | −0 | −0% |
| 2007 | +0.4°C | −6 | +1% |
| 2008 | −0.2°C | −4 | +5% |
| 2009 | −0.1°C | −1 | +1% |
| 2010 | −1.1°C | +31 | −13% |
| 2011 | ±0.0°C | −0 | +3% |
| 2012 | −0.5°C | −5 | −3% |
| 2013 | −0.5°C | +20 | +1% |
| 2014 | +0.1°C | −5 | −3% |
| 2015 | −0.7°C | −3 | +6% |
| 2016 | −0.2°C | −7 | −3% |
| 2017 | +0.1°C | −2 | −0% |
| 2018 | −0.2°C | +6 | −0% |
| 2019 | ±0.0°C | −5 | −2% |
| 2020 | −0.1°C | −7 | +5% |
| 2021 | +0.3°C | −0 | −10% |
| 2022 | +0.6°C | −6 | −0% |
| 2023 | +0.9°C | −1 | −3% |
| 2024 | +0.4°C | −7 | −0% |
Source: NASA POWER daily data from the MERRA-2 reanalysis, 1995-2024. Each value describes a grid square of about 50 km around Letterkenny, not a weather station, and a square that takes in sea or a large lake runs milder than the city itself. That is why this section shows change against the square's own 30-year average rather than counts you could compare with a local station. Rain and snow are left out because their long-term record in this dataset is not consistent over time. "Within the normal year-to-year swing" means the change is smaller than the usual differences between single years.
Which forecast is most accurate in Letterkenny?
CheckWeather Score, graded against the weather that actually happened
The CheckWeather Score blends temperature, wind and rain accuracy, each measured against ERA5 (the recorded weather) over the last 30 days across 60 cities. Lower error means a higher score. See which forecast model is most accurate in Ireland, how we measure forecast accuracy, or which model each weather app uses.
Bottom line: over the last 30 days the European model has been the most accurate forecast for Letterkenny, scoring 98/100 on our CheckWeather Score, ahead of the Met Office at 91. See the full IE accuracy scoreboard for exactly how every model is tested.
What do you think of the forecasts?
your vote countsThe accuracy above is the measured record. This is your opinion: which forecast service do you trust most in Ireland? Give each 1 to 5 stars.
One vote per service. Anonymous: we store no personal data, only a one-way hash of your connection for a day to stop double votes.
Where the models disagree
temperature and rain, judged separatelyThe models often agree on temperature and still split on rain, and rain is usually what decides whether a plan survives. A wide rain range means the shower is genuinely uncertain, not that the forecast is wrong.