What is the current water temperature in Greystones?

Q: What is the current water temperature in Greystones?

As of now, in Greystones, the water temperature is 11.48°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 > Greystones

Water temperature in Greystones

Detailed information about the current water temperature in Greystones. 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.

52.7

°F

May 17, 05:20

Trend:

increasing

Yesterday:

52.5°F

Tomorrow:

52.7°F

Sunrise:

05:23

Sunset:

21:19

Day Length:

15 h. 56 min.

Greystones in May

Minimum:

46.5°F

Average:

48.8°F

Maximum:

50.3°F

Sea water temperature in Greystones today

As of now, in Greystones, the water temperature is 52.7°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 1.0°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to stay about the same.

Recent sea temperature and forecast

The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 53.6°F on 2025, while the historical minimum was 50.1°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 suggests a gradual increase. The average temperature is expected to rise up to 53.2°F, with minimum temperature starting at 52.7°F, while the maximum might reach 53.5°F.

Daily water temperature in Greystones

Date	Current Year actual* / forecast**	last year	10 years average
May 3	50.9°F	50.9°F	49.8°F
May 4	51.7°F	51.0°F	50.1°F
May 5	51.6°F	51.6°F	50.3°F
May 6	51.4°F	51.5°F	50.3°F
May 7	51.4°F	51.2°F	50.4°F
May 8	51.7°F	51.8°F	50.6°F
May 9	52.0°F	52.1°F	50.9°F
May 10	52.1°F	52.0°F	50.8°F
May 11	52.9°F	52.1°F	51.0°F
May 12	53.0°F	52.2°F	51.1°F
May 13	52.8°F	53.2°F	51.3°F
May 14	52.9°F	53.3°F	51.4°F
May 15	52.8°F	53.1°F	51.6°F
May 16	52.5°F	53.5°F	51.5°F
May 17	52.7°F	53.6°F	51.7°F
May 18	52.7°F	54.2°F	51.7°F
May 19	53.0°F	54.7°F	52.0°F
May 20	53.2°F	55.1°F	52.2°F
May 21	53.2°F	54.9°F	52.2°F
May 22	53.3°F	55.4°F	52.3°F
May 23	53.5°F	55.3°F	52.5°F
May 24	53.5°F	55.2°F	52.5°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 Greystones by month

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

The warmest water in Greystones was recorded on September 10, 2023, reaching a 62.3°F. While the coldest temperature occurred on March 11, 2018, dipping to 43.0°F. The average readings by season are 48.0°F in Winter, 48.7°F in Spring, 57.9°F in Summer, and 56.7°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Bray	52.8°F	5mi
Dún Laoghaire	53.1°F	11mi
Dublin	53.4°F	15mi

* current water temperature in this city

** straight line distance from Greystones