Ireland · 1991–2020

Best time to visit
Letterkenny

For Letterkenny, July has the most comfortable weather in our climate comparison. Typical daytime highs are 16.9°C, nights average 12°C, and rainfall totals about 92 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.

Best all-round monthJuly

Typical daytime high16.9°C

Typical night-time low12°C

July rainfall92 mm

Overall comfort

July

Other strong months: August and June

51/100 weather score

Outdoor sightseeing

June

Other strong months: July and August

64/100 weather score

Make the answer personal

Choose the weather
that suits you.

Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.

Daytime high: at least 14°CDaytime high: at most 28°CMonthly rain: no more than 100 mmWet days: no more than 17

2 months fit your choices for Letterkenny

June15.2°C day · 82 mm rain · 13.7 wet days

July16.9°C day · 92 mm rain · 17 wet days

The lowest comfort score is 5 out of 100. January and December share that score. In January, that is mainly because days reach only 8.2°C, 16° below the 24°C the score treats as ideal.

Quick answers

Planning a trip to Letterkenny?

These answers come from the same measured monthly climate record shown on this page.

When is the best time to visit Letterkenny?

July is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 16.9°C and 92 mm of rain.

What is the hottest month in Letterkenny?

August is hottest in this record, with a typical daytime high of 17.1°C and a night-time low of 12.3°C.

Which month has the least rain?

April has the lowest monthly rainfall total at 67 mm.

Is this a weather forecast?

No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.

Month by month

See how the weather
changes through the year.

The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.

58.2° / 3.9°

78.4° / 3.7°

159.4° / 4.5°

2711.1° / 5.9°

3713.3° / 7.9°

4615.2° / 10.2°

5116.9° / 12°

5017.1° / 12.3°

4415.8° / 10.9°

2713.2° / 8.6°

1210.6° / 6.2°

58.8° / 4.3°

Monthly climate evidence for Letterkenny — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	8.2°C	3.9°C	124 mm	19.4	7 h 45	5	Strong coverage
February	8.4°C	3.7°C	100 mm	16.6	9 h 34	7	Strong coverage
March	9.4°C	4.5°C	84 mm	15.9	11 h 38	15	Strong coverage
April	11.1°C	5.9°C	67 mm	13.6	14 h 00	27	Strong coverage
May	13.3°C	7.9°C	74 mm	13.8	16 h 05	37	Strong coverage
June	15.2°C	10.2°C	82 mm	13.7	17 h 19	46	Strong coverage
July	16.9°C	12°C	92 mm	17	16 h 49	51	Strong coverage
August	17.1°C	12.3°C	103 mm	16.8	14 h 58	50	Strong coverage
September	15.8°C	10.9°C	105 mm	16.4	12 h 38	44	Strong coverage
October	13.2°C	8.6°C	119 mm	18.6	10 h 22	27	Strong coverage
November	10.6°C	6.2°C	123 mm	19.8	8 h 18	12	Strong coverage
December	8.8°C	4.3°C	140 mm	20.5	7 h 13	5	Strong coverage

What has changed

Recent daytime highs are
0.8°C warmer in Letterkenny.

Each bar shows the difference between the 2011–2025 average daytime high and the 1961–1990 average for the same month at the same station. A blank month does not have enough older observations for a reliable comparison.

Jan

+0.6

Feb

+1.2

Mar

+0.9

Apr

+1.1

May

+1.0

Jun

+0.5

Jul

+0.9

Aug

+0.6

Sep

+0.7

Oct

+0.4

Nov

+0.8

Dec

+0.8

July daytime highs, 2011–2025. Last recorded: 18.2°C.

Records at MALIN HEAD, 1929–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	14.5°C24 Jan 2016	-6.2°C1 Jan 1979	46 mm27 Jan 1978	204 mm2018 · driest 22 mm in 1997	81
February	14.6°C23 Feb 2019	-6.2°C22 Feb 1986	44 mm22 Feb 1958	216 mm2020 · driest 4 mm in 1932	81
March	19.9°C25 Mar 2012	-4.4°C2 Mar 1986	31 mm11 Mar 2006	154 mm1992 · driest 19 mm in 1996	81
April	23.4°C30 Apr 2025	-1.8°C2 Apr 1968	32 mm23 Apr 1971	125 mm1993 · driest 13 mm in 1938	81
May	25.1°C25 May 2017	-0.5°C3 May 1967	35 mm21 May 1995	138 mm2015 · driest 10 mm in 2008	82
June	25.8°C15 Jun 1957	2.6°C8 Jun 1989	39 mm22 Jun 2012	140 mm2012 · driest 14 mm in 2010	81
July	27.6°C12 Jul 2025	4.4°C8 Jul 1934	39 mm9 Jul 1987	192 mm2023 · driest 15 mm in 1955	82
August	27.1°C24 Aug 1955	5.2°C21 Aug 1964	73 mm22 Aug 2017	183 mm1985 · driest 13 mm in 1995	81
September	26.2°C7 Sep 2023	2.0°C28 Sep 1974	56 mm17 Sep 1957	217 mm1985 · driest 14 mm in 1933	81
October	21.1°C2 Oct 1959	0.4°C18 Oct 1993	60 mm21 Oct 1987	252 mm1990 · driest 30 mm in 1985	81
November	17.6°C16 Nov 1997	-2.5°C30 Nov 1977	54 mm1 Nov 1967	233 mm2015 · driest 24 mm in 1983	81
December	16.0°C16 Dec 2015	-4.8°C27 Dec 1995	66 mm5 Dec 2015	263 mm2015 · driest 42 mm in 1963	81

Typical days per month at MALIN HEAD, 1991–2020
Month	Days 25°C+	Frost nights	Heavy rain (10 mm+)
January	0	2	3
February	0	2	2
March	0	1	2
April	0	<1	1
May	<1	0	2
June	0	0	2
July	<1	0	2
August	<1	0	2
September	0	0	2
October	0	0	3
November	0	<1	3
December	0	1	4

How often different weather occurs at MALIN HEAD, based on its daily record
Month	Dry days reaching 20°C	Wet days	Days with heavy rain	Weeks with 3+ wet days	Typical high by year
January	0%	58%	8%	75%	6.8–8.9°C
February	0%	51%	6%	67%	6.5–9.4°C
March	0%	46%	4%	61%	7.5–10.7°C
April	<1%	42%	3%	56%	9.2–12.1°C
May	2%	39%	3%	51%	12.1–14.4°C
June	4%	42%	5%	57%	14.2–16.6°C
July	5%	47%	6%	68%	15.4–17.9°C
August	5%	50%	7%	69%	15.8–18.1°C
September	2%	51%	8%	69%	14.7–16.7°C
October	<1%	56%	9%	74%	12.1–14.4°C
November	0%	60%	9%	77%	9.2–11.5°C
December	0%	61%	9%	79%	7.6–9.9°C

A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.

1931Each stripe is one year’s mean temperature against the 69-year average. Warmest: 2025. Coolest: 1979.2025

The evidence behind this page

Where these figures
come from.

Place identity: GeoNames 2962961
NOAA station: EI000003980 · MALIN HEAD
Station distance: 53.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 27 usable years
Daylight: Calculated from latitude 54.95°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

Next step

Choose your month.
Then plan the details.

The weather comparison for Letterkenny is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.

How travel partnerships will work

Keep exploring

Same climate evidence,
different places.

These places read the same station, so their climate numbers are identical. Their setting, population and distance from MALIN HEAD are not.

Northern IrelandLondonderry County BoroughJuly is the strongest comfort month on this shared record · population 87,153Explore the year Northern IrelandDerryJuly is the strongest comfort month on this shared record · population 83,652Explore the year Northern IrelandColeraineJuly is the strongest comfort month on this shared record · population 25,681Explore the year Northern IrelandLimavadyJuly is the strongest comfort month on this shared record · population 11,279Explore the year Northern IrelandPortstewartJuly is the strongest comfort month on this shared record · population 8,394Explore the year UlsterBuncranaJuly is the strongest comfort month on this shared record · population 6,785Explore the year

Or put two places side by side: Letterkenny vs Londonderry County Borough

Best time to visitLetterkenny