Water temperature in Lagune du Letty

This data the coastal Lagune du Letty 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 Lagune du Letty

Water temperature in Lagune du Letty today is 16.9°C. Based on our historical data over a period of ten years, the warmest water in this day in the Bay of Biscay near Lagune du Letty was recorded in 2014 and was 18.2°C, and the coldest was recorded in 2018 at 15.5°C. Sea water temperature in Lagune du Letty is expected to drop to 16.1°C in the next 10 days. September average water temperature in Lagune du Letty is 17.1°C, the minimum temperature is 14.6°C, and the maximum is 20°C.

Throughout the year, the water temperature in Lagune du Letty does not rise above 20°C and therefore is not suitable for comfortable swimming. But on some days of September, the water temperature warms up to 20°C and above. The average water temperature in Lagune du Letty in winter reaches 10.7°C, in spring 12°C, in summer the average temperature rises to 17°C, and in autumn it is 15.6°C.

Lagune du Letty water temperature now

The sea salinity in Lagune du Letty is 34.37‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Lagune du Letty 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 Lagune du Letty. 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 Lagune du Letty. 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 Lagune du Letty

Lagune du Letty weather forecast

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
9.1°C	8.7°C	8.5°C	11.8°C

12-15 h	15-18 h	18-21 h	21-24 h
16.2°C	17.5°C	14.6°C	10.3°C

Lagune du Letty water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Lagune du Letty. 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 Lagune du Letty 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 Lagune du Letty

The nearest beaches and cities from Lagune du Letty 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
Ile-Tudy	16.9°C	18°C		0.24 m
Mousterlin	17°C	18°C		0.19 m
Beg Meil	17.1°C	18°C		0.19 m
Cap Coz	16.8°C	18°C		0.19 m
Guilvinec	16.9°C	15°C		0.75 m
Trevignon	17.4°C	18°C		0.38 m
Pont Aven	16.9°C	18°C		0.38 m
Penmarch	17.3°C	15°C		0.78 m
Riec Sur Belon	16.8°C	18°C		0.36 m
Ploneour-Lanvern	16.8°C	15°C		0.75 m

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Our report for Lagune du Letty 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.