This data the coastal Arcachon 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.
Water temperature in Arcachon today is 21.2°C. Based on our historical data over a period of ten years, the warmest water in this day in Arcachon was recorded in 2022 and was 23.4°C, and the coldest was recorded in 2007 at 19.9°C. Sea water temperature in Arcachon is expected to drop to 20.3°C in the next 10 days. September average water temperature in Arcachon is 20.2°C, the minimum temperature is 17.7°C, and the maximum is 24°C.
The swimming season in Arcachon lasts from July to September. During those months, Arcachon water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Arcachon in winter reaches 11.7°C, in spring 13.6°C, in summer the average temperature rises to 20.4°C, and in autumn it is 17.8°C.
5 September 2025 |
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today temp |
21.2°C |
4 September 2025 |
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yesterday temp |
21.1°C |
The sea salinity in Arcachon is 32.80‰, and the average salinity of the World Ocean is 35‰.
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 Arcachon. 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 Arcachon. 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 h | 3-6 h | 6-9 h | 9-12 h |
---|---|---|---|
7' 0" | 6' 6" | 6' 0" | 5' 7" |
2.13 m | 1.99 m | 1.84 m | 1.7 m |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
5' 2" | 4' 9" | 4' 4" | 4' 0" |
1.57 m | 1.45 m | 1.33 m | 1.23 m |
Data in a table show Arcachon temperature today (6 September 2025). For more information and forecast for a few days, go to the weather forecast Arcachon.
0-3 h | 3-6 h | 6-9 h | 9-12 h |
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16.9°C | 16.5°C | 15.6°C | 17.2°C |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
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22.2°C | 23.9°C | 24°C | 19.5°C |
You may also be interested in other sections of our site for Arcachon: Sunrise and Sunset, Tides
These figures shows the average, minimum and maximum monthly sea temperature in Arcachon. 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 Arcachon 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
Month | Avr | Min | Max | |
---|---|---|---|---|
January | 11.6°C | 9.7°C | 13.6°C | cold |
Sea water temperature in Arcachon in January | ||||
February | 10.8°C | 8.8°C | 12.3°C | cold |
Sea water temperature in Arcachon in February | ||||
March | 11.5°C | 9°C | 13.9°C | cold |
Sea water temperature in Arcachon in March | ||||
April | 13.4°C | 11°C | 16.5°C | cold |
Sea water temperature in Arcachon in April | ||||
May | 15.8°C | 12.6°C | 20.4°C | cold |
Sea water temperature in Arcachon in May | ||||
June | 18.7°C | 14.5°C | 21.5°C | cold |
Sea water temperature in Arcachon in June | ||||
July | 21°C | 18.4°C | 23.8°C | warm |
Sea water temperature in Arcachon in July | ||||
August | 21.6°C | 19.7°C | 24.9°C | warm |
Sea water temperature in Arcachon in August | ||||
September | 20.2°C | 17.7°C | 24°C | warm |
Sea water temperature in Arcachon in September | ||||
October | 18°C | 14.9°C | 21.3°C | cold |
Sea water temperature in Arcachon in October | ||||
November | 15.1°C | 12.1°C | 18.4°C | cold |
Sea water temperature in Arcachon in November | ||||
December | 12.8°C | 11.3°C | 15.8°C | cold |
Sea water temperature in Arcachon in December |