What is the current water temperature in Dún Laoghaire?

Q: What is the current water temperature in Dún Laoghaire?

As of now, in Dún Laoghaire, the water temperature is 8.93°C. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration.

Ireland > Dún Laoghaire

Water temperature in Dún Laoghaire

Detailed information about the current water temperature in Dún Laoghaire. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.

48.1

°F

April 12, 16:01

Trend:

stable

Yesterday:

48.5°F

Tomorrow:

48.1°F

Sunrise:

06:33

Sunset:

20:19

Day Length:

13 h. 46 min.

Dún Laoghaire in April

Minimum:

45.3°F

Average:

48.4°F

Maximum:

50.4°F

Sea water temperature in Dún Laoghaire today

As of now, in Dún Laoghaire, the water temperature is 48.1°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 0.2°F higher than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to stay about the same.

Recent sea temperature and forecast

Today's water temperature slightly varies from the average of the past two weeks. It also falls within the range of the average temperature recorded for this date, suggesting a consistent weather trend. The maximum temperature recorded for this date was 50.1°F on 2025, while the historical minimum was 44.9°F on 2018.

latest data

last year

Over the last two weeks, the water temperature has stayed slightly above than historical averages for those days. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 48.3°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Dún Laoghaire

Date	Current Year actual* / forecast**	last year	10 years average
Mar 29	47.5°F	48.0°F	46.9°F
Mar 30	47.7°F	48.1°F	46.9°F
Mar 31	47.7°F	48.1°F	46.9°F
Apr 1	48.1°F	48.3°F	47.1°F
Apr 2	47.9°F	48.4°F	47.2°F
Apr 3	47.8°F	48.4°F	47.2°F
Apr 4	48.3°F	48.6°F	47.2°F
Apr 5	47.9°F	48.6°F	47.3°F
Apr 6	47.8°F	49.1°F	47.4°F
Apr 7	48.2°F	48.8°F	47.6°F
Apr 8	47.9°F	49.0°F	47.6°F
Apr 9	47.9°F	49.6°F	47.6°F
Apr 10	48.5°F	49.8°F	47.7°F
Apr 11	48.5°F	49.6°F	47.7°F
Apr 12	48.1°F	50.1°F	47.8°F
Apr 13	48.1°F	50.0°F	47.8°F
Apr 14	48.2°F	50.1°F	48.0°F
Apr 15	48.4°F	50.0°F	48.1°F
Apr 16	48.4°F	49.7°F	48.2°F
Apr 17	48.4°F	49.4°F	48.1°F
Apr 18	48.5°F	49.1°F	48.3°F
Apr 19	48.4°F	49.1°F	48.1°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Dún Laoghaire by month

In an average year, Dún Laoghaire offers no days when the water temperature is warm enough to swim comfortably.

The warmest water in Dún Laoghaire was recorded on August 14, 2022, reaching a 62.6°F. While the coldest temperature occurred on March 11, 2018, dipping to 42.8°F. The average readings by season are 47.5°F in Winter, 48.7°F in Spring, 58.5°F in Summer, and 56.5°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Dublin	47.9°F	5mi
Bray	48.2°F	6mi
Greystones	48.2°F	11mi

* current water temperature in this city

** straight line distance from Dún Laoghaire