Water temperature in Forty Foot

This data the coastal Forty Foot sea water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.

Current sea temperature in Forty Foot

Water temperature in Forty Foot today is 15°C. Based on our historical data over a period of ten years, the warmest water in this day in the Irish Sea near Forty Foot was recorded in 2021 and was 16.1°C, and the coldest was recorded in 2013 at 13.7°C. Sea water temperature in Forty Foot is expected to drop to 14.1°C in the next 10 days. September average water temperature in Forty Foot is 14.8°C, the minimum temperature is 13.3°C, and the maximum is 16.9°C.

Throughout the year, the water temperature in Forty Foot does not rise above 20°C and therefore is not suitable for comfortable swimming. The average water temperature in Forty Foot in winter reaches 8.8°C, in spring 9.1°C, in summer the average temperature rises to 14.2°C, and in autumn it is 13.5°C.

Forty Foot water temperature now

The sea salinity in Forty Foot is 33.95‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Forty Foot for today

Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Forty Foot. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Forty Foot. Data in table shown for 26 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Forty Foot

Forty Foot weather forecast

Current temperature and weather

Data in a table show Forty Foot temperature today (26 September 2025). For more information and forecast for a few days, go to the weather forecast Forty Foot.

0-3 h	3-6 h	6-9 h	9-12 h
10.1°C	10.6°C	10.4°C	13.8°C

12-15 h	15-18 h	18-21 h	21-24 h
14.6°C	15.1°C	12.9°C	12.2°C

Forty Foot water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Forty Foot. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Forty Foot on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve

Chart monthly average water temperature in Forty Foot

The nearest beaches and cities from Forty Foot with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

	Water	Weather		Wave
Dollymount	15°C	16°C		0.61 m
Sandymount	15°C	16°C		0.61 m
Burrow Beach	15°C	16°C		0.61 m
Portmarnock	14.9°C	16°C		0.66 m
Donabate	14.9°C	16°C		0.66 m
Kilcoole	15.1°C	14°C		0.74 m
Malahide	14.9°C	16°C		0.66 m
Loughshinny	14.8°C	16°C		0.71 m
Rush	14.8°C	16°C		0.71 m
Portraine	14.8°C	16°C		0.71 m

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Our report for Forty Foot is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.