Londonderry County Borough weather in August

In August, Londonderry County Borough sees average daytime highs of 17°C and overnight lows near 12°C, with 94 mm of rain across 16.7 wet days and about 14.7 hours of daylight. It is the 2nd-warmest and 1st-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 August, and the air most often feels dry.

Daylight stretches from about 15 h 42 min at the start of August to 13 h 42 min by month's end. Set against the rest of the year, August is Londonderry County Borough's 10th-clearest and 11th-windiest month. For the whole year in context, see Londonderry County Borough's year-round climate.

Daytime high
17°
2nd warmest
Overnight low
12°
12th coldest
Rainfall
94 mm
16.7 wet days
Daylight
14 h 48 min
5:11 AM – 7:56 PM
Cloud cover
81%
10th clearest
Wind
14 km/h
11th windiest
Solar energy
3.61 kWh/m²
Travel score
4.5
out of 10

Londonderry County Borough is city in Northern Ireland.

Density
225/km²
people per km²
Founded
~501 CE

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

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

A typical August day in Londonderry County Borough 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 15°C and 20°C. Set against its neighbours, August runs on par with July and about 2°C warmer than September.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11812
21812
31812
41812
51812
61812
71812
81812
91812
101812
111812
121812
131712
141712
151712
161712
171712
181712
191712
201711
211711
221711
231711
241711
251711
261711
271711
281711
291711
301711
311711

How August really feels in Londonderry County Borough

Once humidity and wind are folded in, August 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

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

Londonderry County Borough weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 8716.427.50.8
Feb / 7514.91.99.31.0
Mar / 7515.61.211.41.6
Apr11° / 7415.40.313.82.4
May14° / 7815.10.115.83.4
Jun16° / 10°8715.50174.1
Jul17° / 12°9316.8016.54.5
Aug17° / 12°9416.7014.74.5
Sep16° / 10°7514.2012.54.1
Oct13° / 8815.50.110.22.9
Nov10° / 9016.70.38.11.6
Dec / 9015.81.271.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 3% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 10% of August, with mostly cloudy or overcast conditions the remaining 87%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11090
21090
31090
41090
51090
61090
71189
81189
91189
101288
111288
121387
131387
141387
151387
161486
171486
181486
191486
201486
211486
221585
231585
241585
251684
261684
271684
281684
291684
301684
311684

Chance of precipitation in August

Any precipitation

Londonderry County Borough gets around 94 mm of rain over 16.7 wet days in August, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 55% and peaks near 58% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
156
256
355
455
555
654
754
854
954
1054
1155
1255
1356
1457
1557
1658
1758
1858
1958
2058
2157
2256
2355
2454
2553
2652
2751
2850
2949
3049
3148

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the dry band about 71% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
166304
266304
366304
466304
566304
666304
767303
867303
967303
1067303
1168302
1268302
1368302
1468302
1568302
1669292
1770282
1870282
1971272
2072262
2173252
2274242
2375232
2477221
2578211
2679201
2779192
2879192
2980182
3081181
3182171

Wind in August

Winds average 14 km/h in August.

Across August, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light 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 August

DaylightNight

Daylight runs from about 15 h 42 min at the start of August to 13 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 120 minutes over August. Sunrise moves from 4:43 AM to 5:40 AM, and sunset from 8:27 PM to 7:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.74:438:27
215.74:458:26
315.64:478:24
415.64:488:22
515.54:508:20
615.44:528:18
715.44:548:16
815.34:568:14
915.24:588:11
1015.25:008:09
1115.15:018:07
1215.05:038:05
1315.05:058:03
1414.95:078:00
1514.85:097:58
1614.85:117:56
1714.75:137:54
1814.65:157:51
1914.55:177:49
2014.55:187:46
2114.45:207:44
2214.35:227:42
2314.25:247:39
2414.25:267:37
2514.15:287:34
2614.05:307:32
2714.05:327:29
2813.95:347:27
2913.85:367:24
3013.75:387:22
3113.75:407:19

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 3.61 kWh/m².

For context, solar energy here swings from a low near 0.42 kWh/m² to a high of 4.84 kWh/m² in May across the year — August's 3.61 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
14.0Moderate
23.9Moderate
33.9Moderate
43.9Moderate
53.9Moderate
63.8Moderate
73.8Moderate
83.8Moderate
93.8Moderate
103.7Moderate
113.7Moderate
123.7Moderate
133.7Moderate
143.7Moderate
153.6Moderate
163.6Moderate
173.6Moderate
183.6Moderate
193.5Moderate
203.5Moderate
213.5Moderate
223.5Moderate
233.4Moderate
243.4Moderate
253.4Moderate
263.3Moderate
273.3Moderate
283.3Moderate
293.2Moderate
303.2Moderate
313.1Moderate
Planning a trip in August

Is August a good time to visit Londonderry County Borough?

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

4.5
Sightseeing
1st-best month of the year
Beach & pool
never really warm enough

August is a reasonable time to visit Londonderry County Borough for sightseeing.

What to pack for Londonderry County Borough in August

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

In August, Londonderry County Borough sees daytime highs around 17°C and nights near 12°C. Pack rain gear. About 17 days see rain.

rain gear

Sea temperature near Londonderry County Borough in August

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

The sea at the nearest coast (about 42 km away) is warmest in August at about 15°C and coldest in February near 8°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
Feb8Bracing
Mar8Bracing
Apr9Bracing
May10Bracing
Jun12Bracing
Jul14Bracing
Aug15Bracing
Sep14Bracing
Oct13Bracing
Nov12Bracing
Dec10Bracing

UV index in Londonderry County Borough in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 Londonderry County Borough peaks around July 13 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 13UV 5Jan 1UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Moderate
Apr3Moderate
May5High
Jun5Moderate
Jul5High
Aug5Moderate
Sep3Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Londonderry County Borough?

Londonderry County Borough sits at 55.0°N, 7.3°W, 24 m above sea level, in United Kingdom. The nearest listed city is Derry, 0.0 km away.

BallymenaAntrimPortadownCraigavon

Topography around Londonderry County Borough

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

Within 3 km, the terrain around Londonderry County Borough has only modest variations in elevation — a maximum elevation change of 192 m around an average of 47 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 481 m; within 80 km, large variations in elevation — a maximum elevation change of 706 m.

The land around Londonderry County Borough is covered by artificial surfaces (31%), grassland (30%) and trees (27%) within 3 km, grassland (65%) within 16 km, and grassland (57%) and water (34%) within 80 km.

3 km
192 m
16 km
481 m
80 km
706 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Derry 0.0 km · Letterkenny 28 km · Coleraine 44 km · Omagh 44 km · Ballymena 68 km · Antrim 77 km · Portadown 85 km · Craigavon 85 km

United Kingdom travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type D / G / M
230 V · 50 Hz
Prices
≈ 89% of US
price level, 2025
GDP per capita
$57,602
2025
Happiness
6.7 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2021
Road deaths
3.2
per 100k/yr, 2019
Income group
High
World Bank
Religion
Christian 60%none 26%Muslim 4%other 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 Londonderry County Borough (54.9972°, -7.3092°, elevation 24 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).