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Dún Laoghaire in May 2027: weather, temperatures and activities

Do you want to visit Dún Laoghaire in May 2027? Discover the usual weather at this time of year, average temperatures, the risk of rain, possible activities, and our opinion on whether May is a good month to travel to Dún Laoghaire, Ireland.

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Is it worth visiting Dún Laoghaire in May?

Check your ideal travel criteria and see if the month of May suits your plans to go to Dún Laoghaire.
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Dún Laoghaire in May 2027: weather, temperatures and activities

Page summary

Dún Laoghaire in May in summary
Fair weather
Min 9°C Max 13°C 72 mm 4 day(s) 88% 49% 12°C 12.6 h/day
Best activities in May
Beach and swimmingHiking and trekkingCultural visits and heritageNature and landscapesNightlifeGastronomyBoat trip and cruise
Practical guidelines
High crowding 04:25 20:18
Hourly weather

Average weather in Dún Laoghaire in May 2027

Fair weather

The weather in Dún Laoghaire in May 2027 is based on statistical data from previous years in May. This allows you to forecast the weather in May 2027. Check the hourly statistics (6:00, 9:00, 12:00, 15:00, 18:00, 21:00, 0:00 and 3:00), with the associated average temperature, for the whole month, and also, by navigating the tabs, for the beginning, middle and end of the month.

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Climate

Climate of Dún Laoghaire in May

Temperatures, precipitation and monthly trends help to better understand the climate in Dún Laoghaire in May.

Temperatures and rain in Dún Laoghaire in May

Average daily weather

Temperatures and rain day by day in May.
Minimal Average Maximums Average rainfall

Monthly temperatures

The month of May is highlighted to compare it quickly with the rest of the year.
Minimal Average Maximums

Monthly precipitation

The bar for the month under study is highlighted.
Average rainfall

About the climate in Dún Laoghaire in May

Seasonal normals

Seasonal normals of Dún Laoghaire in May

Check the seasonal normals in Dún Laoghaire in May and compare the weather with the previous month and the following month (or the months of your choice by selecting months in the form below): temperatures, wind, rain, humidity, climate rating...

Last updated: 12/01/2026
Reference period for normals: January 2009 - December 2025
Month analyzed
May
Weather data April May June
Outside temperature
Average temperature 8.5°C 11.0°C 13.7°C
Maximum temperature 10.5°C 12.8°C 15.4°C
Minimum temperature 6.5°C 9.1°C 12.1°C
Record maximum temperature 16.0°C
(2011)
18.0°C
(2012)
21.0°C
(2018)
Record low temperature -1.0°C
(2021)
2.0°C
(2021)
6.0°C
(2011)
Number of days at +30° 0 day(s)
(0%)
0 day(s)
(0%)
0 day(s)
(0%)
Number of days at +18° 0 day(s)
(0%)
0 day(s)
(0%)
4 day(s)
(13%)
Number of days below 0° 0 day(s)
(0%)
0 day(s)
(0%)
0 day(s)
(0%)
Sea temperature
Sea temperature (average) 9.2°C 10.5°C 12.2°C
Sea temperature (minimum) 8.1°C 9.4°C 10.6°C
Sea temperature (maximum) 10.2°C 11.5°C 13.9°C
Wind
Wind speed 23 km/h 23 km/h 20 km/h
Wind temperature 3.5°C 6.6°C 10.5°C
Precipitation (rain)
Precipitation 72.7 mm 72.4 mm 98.2 mm
Number of days with precipitation 16 day(s)
(53%)
19 day(s)
(61%)
18 day(s)
(60%)
Number of days with significant precipitation (greater than 5 mm) 5 day(s)
(16%)
4 day(s)
(14%)
6 day(s)
(20%)
Record precipitation in one day 22.3 mm
(2016)
26.5 mm
(2013)
35.0 mm
(2012)
Other weather data
Humidity 88% 88% 89%
Visibility 9.2 km 9.2 km 9.1 km
Cloud cover 48% 49% 49%
UV index 3 3 4
Daily sunshine 12h 13h 13h
Sunrise and sunset
Sunrise time 05h25 04h25 03h56
Sunset time 19h26 20h18 20h54
Day length 14h01 15h53 16h58
Our opinion on the climate in May
The review of Where And When adverse weather fair weather favourable weather
Activities and events

What to do in Dún Laoghaire in May?

Best activities in May
Beach and swimmingHiking and trekkingCultural visits and heritageNature and landscapesNightlifeGastronomyBoat trip and cruise
Possible activities in May
Animal observation
Observed weather

What was the weather like in Dún Laoghaire in May last?

Find the observed weather calendar in Dún Laoghaire in May 2025, with each day’s weather, temperatures and precipitation.

Mon. Tue. Wed. Thu. Fri. Sat. Sun.
1
Cloudy
11°C18°C0.0 mm
2
Clear/Sunny
8°C15°C0.0 mm
3
Patchy rain nearby
7°C14°C0.2 mm
4
Patchy rain nearby
5°C10°C0.3 mm
5
Clear/Sunny
8°C10°C0.0 mm
6
Clear/Sunny
6°C14°C0.0 mm
7
Partly Cloudy
8°C15°C0.0 mm
8
Clear/Sunny
9°C12°C0.0 mm
9
Clear/Sunny
6°C15°C0.0 mm
10
Clear/Sunny
8°C18°C0.0 mm
11
Overcast
11°C18°C0.4 mm
12
Overcast
9°C17°C1.5 mm
13
Partly Cloudy
12°C17°C0.0 mm
14
Clear/Sunny
11°C15°C0.0 mm
15
Clear/Sunny
11°C16°C0.0 mm
16
Clear/Sunny
11°C17°C0.0 mm
17
Clear/Sunny
12°C15°C0.0 mm
18
Clear/Sunny
11°C17°C0.0 mm
19
Cloudy
12°C13°C0.0 mm
20
Patchy rain nearby
10°C17°C0.6 mm
21
Cloudy
10°C20°C0.0 mm
22
Clear/Sunny
10°C16°C0.0 mm
23
Partly Cloudy
10°C16°C0.7 mm
24
Overcast
14°C18°C1.3 mm
25
Patchy rain nearby
10°C14°C0.4 mm
26
Patchy rain nearby
10°C13°C0.6 mm
27
Light rain
10°C11°C3.3 mm
28
Patchy rain nearby
10°C16°C0.4 mm
29
Patchy rain nearby
15°C19°C0.1 mm
30
Partly Cloudy
13°C17°C0.2 mm
31
Patchy light drizzle
14°C17°C0.7 mm
Nearby

Where to go near Dún Laoghaire in May?

Compare cities and destinations near Dún Laoghaire in May to find another travel stop, a nearby alternative or a logical continuation of your stay in Dún Laoghaire.

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Every month

Best time to visit Dún Laoghaire month by month

Compare the weather in Dún Laoghaire across all months of the year and open each detailed page to find the best time.

Frequently asked questions

Travel to to Dún Laoghaire in May: your frequently asked questions

Short answers to the questions we ask ourselves before booking for this month.

It's an average period, nothing special. Conditions are mediocre in Dún Laoghaire in May, which ranks this month 5th out of 12. The choice of region will make a real difference.

Expect an average of 13°C during the day and 9°C at night, with about 72 mm of precipitation spread over 4 rainy days.

The sea is only 11°C on average in May. Swimming is still possible, but it will be cool.

Expect about 12.6 hours of sunshine per day on average for this month.

This month is particularly suited to these activities: Beach and swimming, Hiking and trekking, Cultural visits and heritage and Nature and landscapes. These are the ones for which the conditions on site are most favourable.

Visitor numbers are moderate: this month is in High crowding, with an index of 68/100. It is often a good compromise between weather and tranquility.

If your dates are flexible, the most favorable months in Dún Laoghaire are: June, July, August and September. Compare them before finalizing your departure.
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