Water temperature in Vannes in September

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Is it warm enough to swim in Vannes in September? Average water temperature in Vannes in September is 17.9°C and therefore is not suitable for comfortable swimming. The warmest sea in Vannes in September is 21.1°C, and the coldest is 14.9°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Vannes

Changes water temperature in Vannes in September 2025, 2024

To get an accurate forecast for the water temperature in Vannes for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Vannes, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of September.

Sea temperature

Tides

Weather forecast

You can choose any other years:

Day	2025	2024	Min	Max
1 September	19.4°C	18.9°C	17.1°C	20.3°C
2 September	19.1°C	18.9°C	17.2°C	20.6°C
3 September	19.5°C	19.1°C	17.2°C	20.3°C
4 September	19.1°C	18.8°C	17.1°C	20.3°C
5 September	19.1°C	18.7°C	17.1°C	20.8°C
6 September	19°C	18.4°C	16.9°C	20.3°C
7 September	19.3°C	18.6°C	16.8°C	20.2°C
8 September	19.4°C	18.3°C	17°C	21.1°C
9 September	19.3°C	17.7°C	16.9°C	20.9°C
10 September	18.8°C	17.7°C	16.9°C	20.7°C
11 September	18.6°C	17.7°C	16.7°C	20.5°C
12 September	18.3°C	17.1°C	16.2°C	20°C
13 September	18.1°C	17°C	16°C	20.3°C
14 September	18.3°C	17.1°C	16.2°C	20.1°C
15 September	18.3°C	16.8°C	16°C	20.1°C

Day	2025	2024	Min	Max
16 September	18.3°C	17.1°C	15.6°C	19.9°C
17 September	17.7°C	16.9°C	15.1°C	20.3°C
18 September	18.5°C	17.1°C	15.2°C	20.3°C
19 September	18.1°C	17.5°C	15.1°C	19.8°C
20 September	18.3°C	17.4°C	14.9°C	19.6°C
21 September	18.6°C	17.2°C	15.1°C	19.1°C
22 September	18.1°C	17.4°C	15.6°C	19.1°C
23 September	18.1°C	17.3°C	16°C	18.8°C
24 September	17.6°C	17.2°C	16°C	18.7°C
25 September	17.3°C	17.1°C	15.8°C	18.8°C
26 September		17°C	15.5°C	19°C
27 September		16.6°C	15.7°C	18.9°C
28 September		16.6°C	15.6°C	18.3°C
29 September		16.5°C	15.7°C	18.7°C
30 September		16.4°C	15.6°C	19.2°C

Average water temperature in Vannes in September over a decade

2015	2016	2017	2018	2019
17.6°C	18.4°C	17°C	17.7°C	17.9°C

2020	2021	2022	2023	2024
18.8°C	18.9°C	19.3°C	19.5°C	17.5°C

Vannes sea state in September

Chart comparing the height of waves in Vannes in September over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Vannes water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Temperature in neighboring cities

The nearest locations with the average water temperature in September. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

	Avr	Min	Max
Île d'Arz	17.9°C	15.1°C	20.8°C
Gulf of Morbihan	17.9°C	15.1°C	20.8°C
Ile-aux-Moines	17.9°C	15°C	21°C
Sarzeau	17.8°C	14.9°C	20.9°C
Penvins	17.8°C	15°C	20.8°C
Landrezac	17.8°C	15°C	20.8°C
Port Navalo	17.7°C	14.9°C	20.7°C
Arzon	17.8°C	15°C	20.9°C
Baden	17.8°C	15.1°C	21°C
Larmor Baden	17.8°C	15.1°C	21°C

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Our report for Vannes 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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Date (day and month)

Water temperature: min 16°C

Average temperature Maximum temperature