Letterkenny weather in July

In July, Letterkenny sees average daytime highs of 17°C and overnight lows near 12°C, with 101 mm of rain across 18 wet days and about 16.5 hours of daylight. It is the 1st-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 17°C through the month. The sky is clear or mostly clear about 3% of the time in July, and the air most often feels dry.

Daylight stretches from about 17 hours at the start of July to 15 h 48 min by month's end. Set against the rest of the year, July is Letterkenny's 12th-clearest and 12th-windiest month. For the whole year in context, see Letterkenny's year-round climate.

Daytime high
17°
1st warmest
Overnight low
12°
11th coldest
Rainfall
101 mm
18 wet days
Daylight
16 h 36 min
4:20 AM – 8:54 PM
Cloud cover
84%
12th clearest
Wind
14 km/h
12th windiest
Solar energy
4.31 kWh/m²
Travel score
4.3
out of 10

Letterkenny is town in County Donegal, Ireland.

Density
472/km²
people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 17°C through the month.

A typical July day in Letterkenny reaches about 17°C in the afternoon and slips back to 12°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 21°C. Set against its neighbours, July runs about 1°C warmer than June and on par with August.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11711
21711
31711
41711
51711
61711
71711
81711
91711
101711
111711
121712
131712
141712
151712
161712
171712
181712
191712
201712
211712
221812
231812
241812
251812
261812
271812
281812
291812
301812
311812

How July really feels in Letterkenny

Once humidity and wind are folded in, July averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

July sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Letterkenny weather by month

How July compares with the rest of the year at a glance. July is the 1st-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 10818.527.60.8
Feb / 9115.91.89.31.0
Mar / 88171.311.41.5
Apr11° / 8016.10.313.82.3
May14° / 8615.9015.83.3
Jun16° / 10°92160173.9
Jul17° / 12°10118016.54.3
Aug17° / 12°10517.8014.74.3
Sep15° / 10°8815.5012.53.9
Oct13° / 10517.1010.22.8
Nov10° / 11018.80.38.11.6
Dec / 11318.11.270.9

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 3% of the time in July, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 8% of July, with mostly cloudy or overcast conditions the remaining 89%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11486
21486
31486
41387
51288
61288
71189
81189
91189
101189
111090
121090
131090
141090
151189
161189
171189
181288
191288
201189
211189
221189
231189
241189
251189
261090
271090
281090
291090
301189
311189

Chance of precipitation in July

Any precipitation

Letterkenny gets around 101 mm of rain over 18 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 58% and peaks near 61% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
158
258
358
458
558
657
757
857
956
1056
1156
1256
1356
1456
1556
1656
1756
1856
1957
2057
2158
2258
2359
2460
2560
2661
2761
2861
2961
3061
3160

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

Most of July feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, July lands in the dry band about 74% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
184151
283161
382162
481172
581172
681172
781172
880182
980182
1079192
1178193
1277203
1377203
1476213
1575223
1673234
1773234
1872244
1971254
2070264
2169274
2269274
2367285
2466295
2566295
2666295
2765305
2865305
2965305
3066304
3166304

Wind in July

Winds average 14 km/h in July, the calmest month.

Across July, daily wind ranges from about 14 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in July

DaylightNight

Daylight runs from about 17 hours at the start of July to 15 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over July. Sunrise moves from 4:04 AM to 4:43 AM, and sunset from 9:05 PM to 8:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
117.04:049:05
217.04:049:04
317.04:059:04
417.04:069:04
516.94:079:03
616.94:089:03
716.94:099:02
816.94:109:01
916.84:119:00
1016.84:129:00
1116.84:138:59
1216.74:148:58
1316.74:168:57
1416.64:178:56
1516.64:188:55
1616.64:208:54
1716.54:218:52
1816.54:228:51
1916.44:248:50
2016.44:258:49
2116.34:278:47
2216.34:288:46
2316.24:308:44
2416.24:318:43
2516.14:338:41
2616.14:358:39
2716.04:368:38
2816.04:388:36
2915.94:408:34
3015.94:428:33
3115.84:438:31

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 4.31 kWh/m².

For context, solar energy here swings from a low near 0.42 kWh/m² to a high of 4.85 kWh/m² in May across the year — July's 4.31 kWh/m² sits near the top of that range.

024151015202531
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.4Bright
104.4Bright
114.4Bright
124.4Bright
134.4Bright
144.4Bright
154.4Bright
164.4Bright
174.4Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.2Bright
244.2Bright
254.2Bright
264.1Bright
274.1Bright
284.1Bright
294.0Bright
304.0Bright
314.0Moderate
Planning a trip in July

Is July a good time to visit Letterkenny?

Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.3
Sightseeing
1st-best month of the year
Beach & pool
never really warm enough

July is a reasonable time to visit Letterkenny for sightseeing.

What to pack for Letterkenny in July

From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In July, Letterkenny sees daytime highs around 17°C and nights near 12°C. Pack rain gear. About 18 days see rain.

rain gear

Sea temperature near Letterkenny in July

The nearest coast averages about 15°C in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 45 km away) is warmest in August at about 15°C and coldest in February near 9°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

10°15°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan9Bracing
Feb9Bracing
Mar9Bracing
Apr9Bracing
May11Bracing
Jun13Bracing
Jul15Bracing
Aug15Cool
Sep15Bracing
Oct13Bracing
Nov12Bracing
Dec10Bracing

UV index in Letterkenny in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Letterkenny peaks around May 24 at about 5 (high) — a little sun protection helps at midday. It bottoms out near January 1 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowMay 24UV 5Jan 1UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Moderate
Apr3Moderate
May5High
Jun5High
Jul5High
Aug5Moderate
Sep3Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Letterkenny?

Letterkenny sits at 55.0°N, 7.7°W, 8 m above sea level, in Ireland. The nearest listed city is Londonderry County Borough, 28 km away.

Londonderry County BoroughDerryOmaghColeraineSligoBallymenaAntrimPortadown

Topography around Letterkenny

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Letterkenny.

Within 3 km, the terrain around Letterkenny has only modest variations in elevation — a maximum elevation change of 199 m around an average of 73 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 452 m; within 80 km, large variations in elevation — a maximum elevation change of 706 m.

The land around Letterkenny is covered by grassland (60%) and trees (25%) within 3 km, grassland (72%) and trees (20%) within 16 km, and grassland (53%) and water (38%) within 80 km.

3 km
199 m
16 km
452 m
80 km
706 m
treesgrasslandcroplandartificial surfaceswater
July weather nearby: Londonderry County Borough 28 km · Derry 28 km · Omagh 48 km · Coleraine 71 km · Sligo 89 km · Ballymena 94 km · Antrim 101 km · Portadown 101 km

Ireland travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type G
230 V · 50 Hz
Prices
≈ 85% of US
price level, 2025
GDP per capita
$131,592
2025
Happiness
6.9 / 10
World Happiness, 2025
Safe drinking water
96%
of population, 2024
Homicide rate
0.7
per 100k, 2023
Road deaths
3.1
per 100k/yr, 2019
Income group
High
World Bank
Religion
Roman Catholic 69%none 15%Protestant 4%Orthodox 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Letterkenny (54.95°, -7.7333°, elevation 8 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).