Water temperature in Alderney

This data the coastal Alderney 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 Alderney

Water temperature in Alderney today is 17.1°C. Based on our historical data over a period of ten years, the warmest water in this day in the English Channel near Alderney was recorded in 2023 and was 18°C, and the coldest was recorded in 2013 at 16.4°C. Sea water temperature in Alderney is expected to drop to 16.6°C in the next 10 days. September average water temperature in Alderney is 17.2°C, the minimum temperature is 15.8°C, and the maximum is 18.6°C.

Throughout the year, the water temperature in Alderney does not rise above 20°C and therefore is not suitable for comfortable swimming. The average water temperature in Alderney in winter reaches 10.7°C, in spring 10.4°C, in summer the average temperature rises to 15.5°C, and in autumn it is 15.9°C.

Alderney water temperature now

The sea salinity in Alderney is 34.82‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Alderney 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 Alderney. 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 Alderney. 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 Alderney

Alderney weather forecast

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
15°C	14.9°C	14.6°C	14.5°C

12-15 h	15-18 h	18-21 h	21-24 h
14.6°C	14.6°C	14.5°C	14.3°C

Alderney water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Alderney. 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 Alderney 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 Alderney

The nearest beaches and cities from Alderney 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
La Hague	17.2°C	14°C		0.27 m
Vauville	17.2°C	14°C		0.27 m
Siouville-Hague	17.1°C	14°C		0.27 m
Sark	17.1°C	14°C		0.37 m
Querqueville	17.3°C	14°C		0.62 m
Vazon	16.8°C	14°C		0.54 m
Le Rozel	17°C	15°C		0.13 m
Sciotot	17°C	15°C		0.13 m
Saint Peter Port	16.8°C	14°C		0.49 m
Equeurdreville Hainneville	17.3°C	14°C		0.62 m

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Our report for Alderney 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.