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 15.32°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.

59.6

°F

October 3, 16:52

Trend:

decreasing

Yesterday:

60.0°F

Tomorrow:

59.5°F

Sunrise:

07:29

Sunset:

18:57

Day Length:

11 h. 28 min.

Dún Laoghaire in October

Minimum:

44.4°F

Average:

47.2°F

Maximum:

49.2°F

Sea water temperature in Dún Laoghaire today

As of now, in Dún Laoghaire, the water temperature is 59.6°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 1.6°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 is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 59.5°F on 2023, while the historical minimum was 56.0°F on 2018.

latest data

last year

Observations from the last two weeks indicate that the water temperature was in proximity to the highest values recorded on those days in the past. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 59.2°F, the minimum temperature may reach 58.8°F, and the maximum might stay at 59.5°F.

Daily water temperature in Dún Laoghaire

Date	Current Year actual* / forecast**	last year	10 years average
Sep 19	60.7°F	59.5°F	59.3°F
Sep 20	61.2°F	59.3°F	59.4°F
Sep 21	61.1°F	59.3°F	59.3°F
Sep 22	61.3°F	59.2°F	59.1°F
Sep 23	61.2°F	59.1°F	59.1°F
Sep 24	61.0°F	59.1°F	59.0°F
Sep 25	60.8°F	59.0°F	58.9°F
Sep 26	60.7°F	59.0°F	58.9°F
Sep 27	60.7°F	59.1°F	58.9°F
Sep 28	60.5°F	58.6°F	58.7°F
Sep 29	60.2°F	58.7°F	58.4°F
Sep 30	59.9°F	58.7°F	58.5°F
Oct 1	60.1°F	58.7°F	58.4°F
Oct 2	60.0°F	58.5°F	58.3°F
Oct 3	59.6°F	58.4°F	57.9°F
Oct 4	59.5°F	58.7°F	57.8°F
Oct 5	59.4°F	58.5°F	57.7°F
Oct 6	59.3°F	58.1°F	57.6°F
Oct 7	59.2°F	58.5°F	57.6°F
Oct 8	59.1°F	58.1°F	57.5°F
Oct 9	59.0°F	57.5°F	57.3°F
Oct 10	58.8°F	57.5°F	57.2°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 July 25, 2026, reaching a 64.3°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, 48.8°F in Spring, 58.7°F in Summer, and 56.5°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Dublin	59.5°F	5mi
Bray	59.6°F	6mi
Greystones	59.7°F	11mi

* current water temperature in this city

** straight line distance from Dún Laoghaire