Water temperature in Penn Lann

This data the coastal Penn Lann 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 Penn Lann

Water temperature in Penn Lann today is 17.3°C. Based on our historical data over a period of ten years, the warmest water in this day in the Bay of Biscay near Penn Lann was recorded in 2023 and was 18.9°C, and the coldest was recorded in 2013 at 15.9°C. Sea water temperature in Penn Lann is expected to drop to 16.5°C in the next 10 days. September average water temperature in Penn Lann is 17.9°C, the minimum temperature is 15.3°C, and the maximum is 21.2°C.

The swimming season in Penn Lann lasts only one month - August. During this month, Penn Lann water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Penn Lann in winter reaches 9.4°C, in spring 12.2°C, in summer the average temperature rises to 18.4°C, and in autumn it is 15.6°C.

Penn Lann water temperature now

The sea salinity in Penn Lann is 30.25‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Penn Lann 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 Penn Lann. 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 Penn Lann. 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 Penn Lann

Penn Lann weather forecast

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
10.6°C	9°C	8.6°C	12.7°C

12-15 h	15-18 h	18-21 h	21-24 h
16.7°C	18.6°C	16.7°C	14.3°C

Penn Lann water temperature by month

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

The nearest beaches and cities from Penn Lann 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
Kervoyal	17.3°C	19°C		0.17 m
Vannes	17.3°C	18°C		0.25 m
Guerande	17.4°C	19°C		0.38 m
La Baule-Escoublac	17.3°C	19°C		0.41 m
Sene	17.2°C	18°C		0.1 m
Ile-aux-Moines	17.1°C	18°C		0.13 m
Saint Gildas De Rhuys	17.3°C	18°C		0.31 m
Arradon	17.1°C	18°C		0.13 m
Saint Brevin Les Pins	17.6°C	19°C		0.34 m
Hoedic	18.2°C	15°C		0.41 m

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Our report for Penn Lann 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.