Dundalk weather in August

In August, Dundalk sees average daytime highs of 18°C and overnight lows near 12°C, with 83 mm of rain across 13.7 wet days and about 14.6 hours of daylight. It is the 2nd-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 18°C through the month. The sky is clear or mostly clear about 4% of the time in August, and the air most often feels dry.

Daylight stretches from about 15 h 36 min at the start of August to 13 h 36 min by month's end. Set against the rest of the year, August is Dundalk's 11th-clearest and 11th-windiest month. For the whole year in context, see Dundalk's year-round climate.

Daytime high
18°
2nd warmest
Overnight low
12°
11th coldest
Rainfall
83 mm
13.7 wet days
Daylight
14 h 36 min
5:10 AM – 7:49 PM
Cloud cover
80%
11th clearest
Wind
13 km/h
11th windiest
Solar energy
3.61 kWh/m²
Travel score
5.1
out of 10

Dundalk is county town and administrative capital of County Louth, Ireland.

Air quality
Excellent
PM10 14.4 µg/m³ · 2019
Density
1,747/km²
people per km²
Founded
~3499 BCE

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 18°C through the month.

A typical August day in Dundalk reaches about 18°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 16°C and 21°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)
11913
21912
31912
41812
51812
61812
71812
81812
91812
101812
111812
121812
131812
141812
151812
161812
171812
181812
191812
201812
211812
221812
231812
241812
251811
261811
271811
281811
291711
301711
311711

How August really feels in Dundalk

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.

Dundalk 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 / 7113.31.17.70.9
Feb / 5811.919.41.1
Mar / 6012.60.711.51.8
Apr12° / 6512.60.113.72.7
May14° / 6913.8015.73.7
Jun17° / 10°7513016.84.7
Jul18° / 12°7614.5016.35.1
Aug18° / 12°8313.7014.65.1
Sep16° / 10°6712.1012.54.5
Oct13° / 7812.4010.23.2
Nov10° / 8113.30.18.31.9
Dec / 7512.30.77.21.1

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 4% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 13% of August, with mostly cloudy or overcast conditions the remaining 83%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11486
21486
31486
41585
51585
61585
71585
81684
91684
101585
111585
121585
131585
141585
151783
161783
171783
181783
191783
201783
211882
221882
231882
241882
251882
261882
271981
281981
291981
301981
311882

Chance of precipitation in August

Any precipitation

Dundalk gets around 83 mm of rain over 13.7 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 45% and peaks near 49% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
149
249
348
448
548
648
747
847
947
1047
1146
1246
1346
1446
1546
1646
1746
1846
1946
2045
2145
2244
2343
2442
2541
2640
2739
2838
2938
3037
3137

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 67% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
159365
259365
360355
460346
560346
661336
761336
862326
961327
1063316
1163316
1263316
1363316
1464306
1564306
1665305
1766295
1867294
1968284
2068284
2170273
2271263
2371263
2473252
2574242
2674242
2775232
2876222
2976222
3077212
3177212

Wind in August

Winds average 13 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
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 15 h 36 min at the start of August to 13 h 36 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 4:44 AM to 5:38 AM, and sunset from 8:20 PM to 7:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.64:448:20
215.54:468:18
315.54:478:16
415.44:498:14
515.44:518:12
615.34:528:10
715.24:548:08
815.24:568:06
915.14:588:04
1015.05:008:02
1115.05:018:00
1214.95:037:58
1314.85:057:56
1414.85:077:54
1514.75:097:51
1614.65:107:49
1714.65:127:47
1814.55:147:45
1914.45:167:42
2014.45:187:40
2114.35:197:38
2214.25:217:35
2314.25:237:33
2414.15:257:31
2514.05:277:28
2614.05:297:26
2713.95:307:23
2813.85:327:21
2913.75:347:19
3013.75:367:16
3113.65:387:14

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 0.49 kWh/m² to a high of 4.81 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
53.8Moderate
63.8Moderate
73.8Moderate
83.8Moderate
93.7Moderate
103.7Moderate
113.7Moderate
123.7Moderate
133.7Moderate
143.6Moderate
153.6Moderate
163.6Moderate
173.6Moderate
183.6Moderate
193.5Moderate
203.5Moderate
213.5Moderate
223.5Moderate
233.5Moderate
243.4Moderate
253.4Moderate
263.4Moderate
273.3Moderate
283.3Moderate
293.3Moderate
303.2Moderate
313.2Moderate
Planning a trip in August

Is August a good time to visit Dundalk?

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

5.1
Sightseeing
1st-best month of the year
1.7
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Dundalk for sightseeing.

What to pack for Dundalk in August

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

In August, Dundalk sees daytime highs around 18°C and nights near 12°C. Worth packing: rain gear. About 14 days see rain.

rain gear

Sea temperature near Dundalk 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 14 km away) is warmest in August at about 15°C and coldest in March near 8°C.

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

5°10°15°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan9Bracing
Feb8Bracing
Mar8Bracing
Apr9Bracing
May11Bracing
Jun13Bracing
Jul15Bracing
Aug15Cool
Sep14Bracing
Oct13Bracing
Nov12Bracing
Dec10Bracing

UV index in Dundalk 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 Dundalk peaks around August 10 at about 5 (high) — a little sun protection helps at midday. It bottoms out near December 20 at about 0 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowAug 10UV 5Dec 20UV 0
UV index (midday)Level
Jan1Low
Feb1Low
Mar2Moderate
Apr3Moderate
May5High
Jun5High
Jul5High
Aug5High
Sep4Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Dundalk?

Dundalk sits at 54.0°N, 6.4°W, 18 m above sea level, in Ireland. The nearest listed city is Newry, 21 km away.

DroghedaBanbridgeNavanBalbrigganPortadownCraigavonSwords

Topography around Dundalk

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

Within 3 km, the terrain around Dundalk has only modest variations in elevation — a maximum elevation change of 58 m around an average of 18 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 582 m; within 80 km, large variations in elevation — a maximum elevation change of 852 m.

The land around Dundalk is covered by grassland (51%) and artificial surfaces (21%) within 3 km, grassland (57%) within 16 km, and grassland (62%) and water (24%) within 80 km.

3 km
58 m
16 km
582 m
80 km
852 m
treesgrasslandcroplandartificial surfaceswaterwetland
August weather nearby: Newry 21 km · Drogheda 32 km · Banbridge 40 km · Navan 42 km · Balbriggan 46 km · Portadown 47 km · Craigavon 50 km · Swords 61 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 Dundalk (54°, -6.4167°, elevation 18 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).