Ireland · 1991–2020

Best time to visit
Letterkenny.

July leads for comfortable weather in Letterkenny: typically 16.9°C by day, 12°C at night, with 92 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high16.9°C

Typical low12°C

Rain in July92 mm

Comfort

July

July · August · June

51climate match

Beach

July

July · August · June

14climate match

Outdoors

June

June · July · August

64climate match

The weakest month is January, scoring 5 against July’s 51 — days reach only 8.2°C, 16° below the 24°C the score treats as ideal.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

58.2° / 3.9°

Feb

78.4° / 3.7°

Mar

159.4° / 4.5°

Apr

2711.1° / 5.9°

May

3713.3° / 7.9°

Jun

4615.2° / 10.2°

Jul

5116.9° / 12°

Aug

5017.1° / 12.3°

Sep

4415.8° / 10.9°

Oct

2713.2° / 8.6°

Nov

1210.6° / 6.2°

Dec

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

Letterkenny runs +0.8°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

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, not how much — every day in MALIN HEAD’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
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 warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

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

The evidence behind this page

Nearby, measured,
and named.

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.

These places read the same station, so their numbers are identical — distance from MALIN HEAD is what differs

Londonderry County Borough→Derry→Coleraine→Limavady→Portstewart→Buncrana→

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

Best time to visitLetterkenny.

July

July

June

The whole year,without the guesswork.

Letterkenny runs +0.8°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Letterkenny.

The whole year,
without the guesswork.

Letterkenny runs +0.8°C
on the 1961–1990 baseline.

Nearby, measured,
and named.