Dún Laoghaire weather in May
Temperature, sea and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Poor
Best time to visit: April – September
What is the weather like in Dún Laoghaire in May?
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.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 15 h 49 min05:26 – 21:15
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 20 km/haverage daily peakAll months
- Cloud cover
- 68 %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 %52 %
- Few rainy daysweight 20 %36 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in May
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
Dún Laoghaire in May: quick answers
Is Dún Laoghaire hot in May?
No. In May, Dún Laoghaire is cool: daytime highs average 14 °C and nights drop to about 9 °C.
Can you swim in Dún Laoghaire in May?
Only if you don't mind cold water: in May the sea averages just 10.9 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Dún Laoghaire in May?
Rain is frequent, with about 13 rainy days and 61 mm in total.
Dún Laoghaire month by month
The whole year in Dún LaoghaireAll destinations: IrelandWhere to go in MaySea temperature in May
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