AI-generatedDún Laoghaire at a glance
- Best time
- Apr – Sep
- Warmest month
- Jul · 18°
- Warmest sea
- Aug · 15.3°
- Sunshine a year
- 1,390 h
- Rain a year
- 797 mm
- Climate
- Maritime
- Time zone
- UTC+0 / UTC+1
- Elevation
- 16 m
Climate in Dún Laoghaire
Dún Laoghaire has a maritime climate with moderate summers and cool, often grey winters. July is the warmest month with average highs of 18 °C, while January is the coolest at 8 °C. With around 1,390 hours of sunshine a year, Dún Laoghaire is rather dull; May is the sunniest month with 6.1 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Poor
Best time to visit: April – September
Keep in mindFrequent rain
A typical day in October
- Morning, 08:00: about 10°
- Midday, 13:00: about 13°
- Afternoon, 16:00: about 13°
- Evening, 20:00: about 12°
- Night, 23:00: about 11°
07:4918:31
Cool evenings: pack a jumper or a jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 07:28–08:37 · evening 17:43–18:53
- Blue hour
- Morning 07:14–07:28 · evening 18:53–19:06
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Dún Laoghaire in October?
In October, Dún Laoghaire is cool: daytime highs average 14 °C, and nights cool down to about 9 °C. The sea averages 13.6 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 13 rainy days and 79 mm in total. All in all, October is not an ideal month for a holiday in Dún Laoghaire.
More details for October
- Daylight
- 10 h 42 min07:49 – 18:31
- UV index
- 2 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 24 km/haverage daily peakAll months
- Cloud cover
- 73 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+1Europe/Dublin
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %5 %
- Few rainy daysweight 20 %39 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- A jumper for the evenings
- Rain jacket or umbrella
Sea temperature in Dún Laoghaire
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 13.1 – 14.1 °C
Swimming season: Never above 20 °C
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Dún Laoghaire ranges from 8.1 °C in March to 15.3 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
The sea warms up slowly: it is warmest in August, while the air already peaks in July. From October to January the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in August, eight out of ten years were between 14.8 and 16.0 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 9.2° | 8.1° | 9.9° | cold |
| FebruaryFeb | 8.2° | 7.4° | 8.9° | cold |
| MarchMar | 8.1° | 7.1° | 8.9° | cold |
| AprilApr | 9.0° | 8.1° | 9.9° | cold |
| MayMay | 10.9° | 10.2° | 11.9° | cold |
| JuneJun | 13.3° | 12.4° | 14.4° | cold |
| JulyJul | 14.8° | 13.9° | 16.0° | cold |
| AugustAug | 15.3° | 14.8° | 16.0° | cold |
| SeptemberSep | 14.7° | 14.0° | 15.4° | cold |
| OctoberOct | 13.6° | 13.1° | 14.1° | cold |
| NovemberNov | 12.3° | 11.7° | 12.8° | cold |
| DecemberDec | 10.6° | 9.9° | 11.3° | cold |
Sunshine hours in Dún Laoghaire
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 3.3 of 10.7 hours of daylight in Dún Laoghaire, 31 % of the day.
Sunshine hours: measured at the weather station 20 km away, averages 1991–2020 (WMO climate normals). Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Dún Laoghaire
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 2 · lowLittle protection needed; sunglasses on bright days.
The sun is strongest in June (UV 7).
Minutes until sunburn in October
- Very fair skin
- about 80 min
- Fair skin
- about 100 min
- Light brown skin
- over 2 h
- Olive skin
- over 2 h
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Dún Laoghaire: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Dún Laoghaire has about 13 rainy days with 79 mm of rain in total.
Wind and clouds in Dún Laoghaire
How breezy and how cloudy Dún Laoghaire is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Dún Laoghaire typically peaks at 24 km/h during the day: Beaufort 4, moderate breeze.
Breezy months for windsurfing and kiting
From Beaufort 4 (20 km/h) the daily breeze is usually enough for windsurfing and often for kiting: Aug – Jun.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 73 % of the sky over Dún Laoghaire: mostly cloudy, with about 3.3 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Dún Laoghaire
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Cold 0–8°
- Cool 8–15°
CoolOctober: nights around 9°. A duvet at night and a jumper for the evening.
The coolest nights are in January (4°), the warmest in July (13°). Nights fall below 8 °C on average from November to April, so the room should be heated.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 9 | 8° | 4° | 9.2° | 1.7 h | 12 | 62 |
| FebruaryFeb | 9 | 8° | 4° | 8.2° | 2.6 h | 11 | 52 |
| MarchMar | 10 | 10° | 5° | 8.1° | 3.4 h | 12 | 54 |
| AprilApr | 16 | 12° | 6° | 9.0° | 5.2 h | 12 | 59 |
| MayMay | 17 | 14° | 9° | 10.9° | 6.1 h | 13 | 61 |
| JuneJun | 17 | 17° | 11° | 13.3° | 5.6 h | 12 | 69 |
| JulyJul | 12 | 18° | 13° | 14.8° | 4.9 h | 14 | 72 |
| AugustAug | 14 | 18° | 13° | 15.3° | 4.9 h | 13 | 73 |
| SeptemberSep | 13 | 17° | 12° | 14.7° | 4.2 h | 12 | 67 |
| OctoberOct | 9 | 14° | 9° | 13.6° | 3.3 h | 13 | 79 |
| NovemberNov | 8 | 10° | 7° | 12.3° | 2.2 h | 13 | 80 |
| DecemberDec | 8 | 8° | 5° | 10.6° | 1.5 h | 12 | 70 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
53.29° N, 6.14° W · 16 m · Europe/Dublin
Best time to visit Dún Laoghaire
The best time to visit Dún Laoghaire is from April to September. The sea stays too cool for a classic beach holiday: even in August it only reaches 15.3 °C. For sightseeing, day trips and hiking, conditions are most comfortable in September. Rain is most frequent from April to August and from October to January; the wettest month is November with 80 mm.
Dún Laoghaire through the seasons
How the weather changes over the seasons, with averages for each.
Dún Laoghaire in spring
Mar – May
Poor
- 10–14 °C by day
- Sea 9 °C
- 5 h of sun a day
- 37 rainy days in all
Dún Laoghaire in summer
Jun – Aug
Poor
- 17–18 °C by day
- Sea 15 °C
- 5 h of sun a day
- 39 rainy days in all
Dún Laoghaire in autumn
Sep – Nov
Poor
- 10–17 °C by day
- Sea 14 °C
- 3 h of sun a day
- 37 rainy days in all
Dún Laoghaire in winter
Dec – Feb
Poor
- 8 °C by day
- Sea 9 °C
- 2 h of sun a day
- 36 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Dún Laoghaire for you.
Your best months: April – June
Based on the climate averages; tap a month to see its details.
Compare two months in Dún Laoghaire
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
May has the better holiday weather in Dún Laoghaire: score 17 against 9. Daytime highs are about the same. The sea is 3 °C cooler in May. The sun shines 3 hours longer a day in May.
| Month | October | May |
|---|---|---|
| Weather score | 9 | 17better |
| Day high | 14° | 14° |
| Night low | 9° | 9° |
| Sea | 13.6° | 10.9° |
| Sunshine | 3.3 h | 6.1 hbetter |
| Rainy days | 13 | 13 |
| Rainfall | 79 mm | 61 mmbetter |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
No month
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Sep
15–28 °C and not too much rain
Rainy months
Apr – Aug, Oct – Jan
12 or more rainy days
Dún Laoghaire month by month
The typical weather for every month at a glance.
9January8° · Sea 9° · 2 h
In January, Dún Laoghaire is cold: daytime highs average 8 °C, and nights cool down to about 4 °C. The sea averages 9.2 °C – swimming is only for the hardy. The sun is scarce, with only about 2 hours a day. Rain is frequent, with about 12 rainy days and 62 mm in total. All in all, January is not an ideal month for a holiday in Dún Laoghaire.
Dún Laoghaire in January9February8° · Sea 8° · 3 h
In February, Dún Laoghaire is cold: daytime highs average 8 °C, and nights cool down to about 4 °C. The sea averages 8.2 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 11 rainy days and 52 mm in total. All in all, February is not an ideal month for a holiday in Dún Laoghaire.
Dún Laoghaire in February10March10° · Sea 8° · 3 h
In March, Dún Laoghaire is cold: daytime highs average 10 °C, and nights cool down to about 5 °C. The sea averages 8.1 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 12 rainy days and 54 mm in total. All in all, March is not an ideal month for a holiday in Dún Laoghaire.
Dún Laoghaire in March16April12° · Sea 9° · 5 h
In April, Dún Laoghaire is cool: daytime highs average 12 °C, and nights cool down to about 6 °C. The sea averages 9.0 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 59 mm in total. All in all, April is not an ideal month for a holiday in Dún Laoghaire.
Dún Laoghaire in April17May14° · Sea 11° · 6 h
In May, Dún Laoghaire is cool: daytime highs average 14 °C, and nights cool down to about 9 °C. The sea averages 10.9 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 61 mm in total. All in all, May is not an ideal month for a holiday in Dún Laoghaire.
Dún Laoghaire in May17June17° · Sea 13° · 6 h
In June, Dún Laoghaire is mild: daytime highs average 17 °C, and nights cool down to about 11 °C. The sea averages 13.3 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 69 mm in total. All in all, June is not an ideal month for a holiday in Dún Laoghaire.
Dún Laoghaire in June12July18° · Sea 15° · 5 h
In July, Dún Laoghaire is mild: daytime highs average 18 °C, and nights cool down to about 13 °C. The sea averages 14.8 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. It rains often – on about 14 days, adding up to 72 mm. All in all, July is not an ideal month for a holiday in Dún Laoghaire.
Dún Laoghaire in July14August18° · Sea 15° · 5 h
In August, Dún Laoghaire is mild: daytime highs average 18 °C, and nights cool down to about 13 °C. The sea averages 15.3 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 73 mm in total. All in all, August is not an ideal month for a holiday in Dún Laoghaire.
Dún Laoghaire in August13September17° · Sea 15° · 4 h
In September, Dún Laoghaire is mild: daytime highs average 17 °C, and nights cool down to about 12 °C. The sea averages 14.7 °C – swimming is only for the hardy. Expect around 4 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 67 mm in total. All in all, September is not an ideal month for a holiday in Dún Laoghaire.
Dún Laoghaire in September9October14° · Sea 14° · 3 h
In October, Dún Laoghaire is cool: daytime highs average 14 °C, and nights cool down to about 9 °C. The sea averages 13.6 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 13 rainy days and 79 mm in total. All in all, October is not an ideal month for a holiday in Dún Laoghaire.
Dún Laoghaire in October8November10° · Sea 12° · 2 h
In November, Dún Laoghaire is cool: daytime highs average 10 °C, and nights cool down to about 7 °C. The sea averages 12.3 °C – swimming is only for the hardy. The sun is scarce, with only about 2 hours a day. Rain is frequent, with about 13 rainy days and 80 mm in total. All in all, November is not an ideal month for a holiday in Dún Laoghaire.
Dún Laoghaire in November8December8° · Sea 11° · 2 h
In December, Dún Laoghaire is cold: daytime highs average 8 °C, and nights cool down to about 5 °C. The sea averages 10.6 °C – swimming is only for the hardy. The sun is scarce, with only about 2 hours a day. Rain is frequent, with about 12 rainy days and 70 mm in total. All in all, December is not an ideal month for a holiday in Dún Laoghaire.
Dún Laoghaire in DecemberDún Laoghaire compared
Put Dún Laoghaire side by side with another destination.
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Dún Laoghaire vs. Dublin
In October the holiday weather in Dún Laoghaire and Dublin is about equally good (score 9 vs. 7). During the day it is about as warm in Dublin as in Dún Laoghaire. The sea is about equally warm.
| in October | Dún Laoghaire | Dublin |
|---|---|---|
| Holiday score | 9 | 7 |
| Daytime high | 14° | 14° |
| Sea | 14° | 14° |
| Sunshine | 3 h | 3 h |
| Rainy days | 13 | 13 |
| Best time | Apr – Sep | Jun – Sep |
Through the year
Ireland in October: the best places
In October, Dún Laoghaire ranks 7 of 18 destinations in this country.
- Dublin14°14°40
- 2Kilkenny14°39
- 3Cork14°14°39
- 4Waterford14°37
- 5Killarney14°36
- 6Limerick14°34
- 7Dún LaoghaireThis page14°14°9
- 8Bray14°14°9
Planning a trip to Dún Laoghaire
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Dún Laoghaire in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Dún Laoghaire has its best school-holiday weather during May half-term (score 17) and its weakest during October half-term (score 9).
- 14
Easter holidays
Mar – Apr
Poor
- 11 °C by day
- Sea 9 °C
- 4.7 h of sun a day
- 12 rainy days a month
Keep in mind: Frequent rain
- 17
May half-term
May – Jun
PoorBest holidays
- 15 °C by day
- Sea 11 °C
- 6.0 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
- 13
Summer holidays
Jul – Aug
Poor
- 18 °C by day
- Sea 15 °C
- 4.9 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
- 9
October half-term
Oct
Poor
- 14 °C by day
- Sea 14 °C
- 3.3 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
- 9
Christmas holidays
Dec – Jan
Poor
- 8 °C by day
- Sea 10 °C
- 1.6 h of sun a day
- 12 rainy days a month
Keep in mind: Frequent rain
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- Short trip – train or car is often quicker
- Distance
- 440 km
- Time zone
- UTC+1
- Jet lag
- Hardly any (under 3 h)
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Frequently asked questions about Dún Laoghaire
When is the best time to visit Dún Laoghaire?
The best time to visit Dún Laoghaire is from April to September. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Dún Laoghaire?
The sea temperature in Dún Laoghaire ranges from 8.1 °C in March to 15.3 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
Can you swim in Dún Laoghaire in October?
Only if you don't mind cold water: in October the sea averages just 13.6 °C. Comfortable swimming temperatures are not reached at any time of year.
What is the warmest month in Dún Laoghaire?
July is the warmest month, with average highs of 18 °C and nights around 13 °C. January is the coolest month at 8 °C.
When does it rain most in Dún Laoghaire?
Rain is most frequent from April to August and from October to January; the wettest month is November with 80 mm. The driest month is February with 52 mm.
How many hours of sunshine does Dún Laoghaire get?
Dún Laoghaire gets around 1,390 hours of sunshine a year. The sunniest month is May with 6.1 hours a day; in December there are 1.5 hours a day.
What time zone is Dún Laoghaire in?
Dún Laoghaire uses the time zone Europe/Dublin: UTC+0 in January and UTC+1 in July.
Which school holidays are best for Dún Laoghaire?
Dún Laoghaire has its best school-holiday weather during May half-term (score 17) and its weakest during October half-term (score 9). Holiday ratings (0–100): Easter holidays 14, May half-term 17, Summer holidays 13, October half-term 9, Christmas holidays 9.
Near Dún Laoghaire
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Places with a climate like Dún Laoghaire
Destinations whose weather through the year is closest to Dún Laoghaire's – good alternatives.