Dundalk in Summer
In summer (June, July and August), Dundalk sees average daytime highs around 18°C and overnight lows near 11°C, with 233 mm of rain over about 41 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 18°C. The sky is clear or mostly clear about 5% of the time across summer, and the air most often feels dry.
Summer is Dundalk's best season of the year to visit on our travel score. For the whole year in context, see Dundalk's year-round climate.
- Avg daytime high
- 18°C
- warmest season of the year
- Avg overnight low
- 11°C
- Rainfall
- 233 mm
- 41 wet days
- Avg wind
- 13 km/h
- Travel score
- 5.0
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Dundalk in Summer
Across summer, daytime highs hold fairly steady around 18°C.
A typical summer day in Dundalk reaches about 18°C and drops to 11°C overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Dundalk
Once humidity and wind are folded in, summer brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
summer 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 the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 7° / 3° | 71 | 13.3 | 1.1 | 7.7 | 0.9 |
| Feb | 8° / 3° | 58 | 11.9 | 1 | 9.4 | 1.1 |
| Mar | 9° / 4° | 60 | 12.6 | 0.7 | 11.5 | 1.8 |
| Apr | 12° / 5° | 65 | 12.6 | 0.1 | 13.7 | 2.7 |
| May | 14° / 8° | 69 | 13.8 | 0 | 15.7 | 3.7 |
| Jun | 17° / 10° | 75 | 13 | 0 | 16.8 | 4.7 |
| Jul | 18° / 12° | 76 | 14.5 | 0 | 16.3 | 5.1 |
| Aug | 18° / 12° | 83 | 13.7 | 0 | 14.6 | 5.1 |
| Sep | 16° / 10° | 67 | 12.1 | 0 | 12.5 | 4.5 |
| Oct | 13° / 8° | 78 | 12.4 | 0 | 10.2 | 3.2 |
| Nov | 10° / 5° | 81 | 13.3 | 0.1 | 8.3 | 1.9 |
| Dec | 8° / 3° | 75 | 12.3 | 0.7 | 7.2 | 1.1 |
Cloud cover in Summer
The sky is clear or mostly clear about 5% of the time across summer.
Chance of precipitation in Summer
Dundalk gets around 233 mm of rain over 41 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 13 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 16 h 30 min in early June to 13 h 36 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 4.2 kWh/m².
Is summer a good time to visit Dundalk?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Dundalk for sightseeing.
What to pack for Dundalk in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Dundalk sees daytime highs around 18°C and nights near 11°C. Pack rain gear. Worth having: a warm layer and sun protection. About 41 days see rain.
Sea temperature near Dundalk in Summer
The nearest coast averages about 14°C across summer — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 9 | 8 | 8 | 9 | 11 | 13 | 15 | 15 | 14 | 13 | 12 | 10 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 9 | Bracing |
| Feb | 8 | Bracing |
| Mar | 8 | Bracing |
| Apr | 9 | Bracing |
| May | 11 | Bracing |
| Jun | 13 | Bracing |
| Jul | 15 | Bracing |
| Aug | 15 | Cool |
| Sep | 14 | Bracing |
| Oct | 13 | Bracing |
| Nov | 12 | Bracing |
| Dec | 10 | Bracing |
UV index in Dundalk in Summer
Clear-sky midday UV across summer averages 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 1 | 2 | 3 | 5 | 5 | 5 | 5 | 4 | 2 | 1 | 0 |
| Level | Low | Low | Moderate | Moderate | High | High | High | High | Moderate | Low | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 1 | Low |
| Mar | 2 | Moderate |
| Apr | 3 | Moderate |
| May | 5 | High |
| Jun | 5 | High |
| Jul | 5 | High |
| Aug | 5 | High |
| Sep | 4 | Moderate |
| Oct | 2 | Low |
| Nov | 1 | Low |
| Dec | 0 | Low |
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.
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.
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
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.