World sea water temperatures

Water temperature in Alderney

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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 18.1°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 2022 and was 18.6°C, and the coldest was recorded in 2015 at 16.7°C. Sea water temperature in Alderney is expected to drop to 17.3°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


5 September 2025
today temp
18.1°C
4 September 2025
yesterday temp
18.4°C


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 6 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

0-3 h3-6 h6-9 h9-12 h
4' 4"4' 0"3' 6"3' 2"
1.33 m1.22 m1.06 m0.96 m
12-15 h15-18 h18-21 h21-24 h
2' 10"2' 6"2' 3"2' 1"
0.86 m0.77 m0.69 m0.63 m

Surf report in Alderney

Alderney wave height and direction

Alderney weather forecast

Alderney wind speed and direction

Current temperature and weather

Data in a table show Alderney temperature today (6 September 2025). For more information and forecast for a few days, go to the weather forecast Alderney.

0-3 h3-6 h6-9 h9-12 h
17°C16.9°C16.8°C16.6°C
12-15 h15-18 h18-21 h21-24 h
16.8°C16.9°C17°C17.3°C

You may also be interested in other sections of our site for Alderney: Sunrise and Sunset, Tides

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

MonthAvrMinMax
January10.5°C8.4°C12.2°Ccold
Sea water temperature in Alderney in January
February9.6°C7.9°C10.8°Ccold
Sea water temperature in Alderney in February
March9.4°C7.4°C10.7°Ccold
Sea water temperature in Alderney in March
April10.1°C7.4°C11.8°Ccold
Sea water temperature in Alderney in April
May11.7°C9.4°C13.7°Ccold
Sea water temperature in Alderney in May
June13.7°C11.2°C15.7°Ccold
Sea water temperature in Alderney in June
July15.8°C13.7°C17.7°Ccold
Sea water temperature in Alderney in July
August17°C15.7°C18.4°Ccold
Sea water temperature in Alderney in August
September17.2°C15.8°C18.6°Ccold
Sea water temperature in Alderney in September
October16.2°C14.4°C18.1°Ccold
Sea water temperature in Alderney in October
November14.3°C12.3°C16.2°Ccold
Sea water temperature in Alderney in November
December12.1°C9.1°C13.9°Ccold
Sea water temperature in Alderney in December

Chart monthly average water temperature in Alderney

Water temperature in Alderney

Where is the warmest sea water in the world?

If you want to plan a vacation on the beach and enjoy the warm sea, choose the day of the year, region and the minimum comfortable sea/ocean temperature that interests you. As a result, you will get a list of countries and cities in which the average sea temperature or maximum temperature on this day over the past 10 years exceeds your chosen value

Region
Date (day and month)
Water temperature: min 16°C
 Average temperature  Maximum temperature

Nearby beaches and cities

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

WaterWeatherWave
La Hague18.5°C19°C0.49 m
Vauville18.5°C19°C0.49 m
Siouville-Hague18.7°C19°C0.49 m
Sark18.3°C17°C0.6 m
Querqueville18.4°C19°C0.74 m
Vazon17.6°C17°C1.04 m
Le Rozel19°C17°C0.33 m
Sciotot19°C17°C0.33 m
Saint Peter Port17.7°C17°C0.82 m
Equeurdreville Hainneville18.4°C19°C0.74 m

Alderney photo gallery

  • Alderney
  • Saye beach.
  • Alderney

If you have interesting photos of this place, you can upload them here. Photos will be available to all users after verification by the moderator.

Your comments

✎ A small island with a good number of hotels, restaurants, and pubs. Great uncrowded beaches with fine sand. Not much in the way of entertainment, but great for nature lovers.


✎ Lots of good beaches, but best to go at high tide.

Vote for Channel Islands best beach

Sandy beach

This place is suitable for families with children

Current rating: 4,0 (3 votes cast)

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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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.

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