Water temperature in Nantes in September

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Is it warm enough to swim in Nantes in September? Average water temperature in Nantes in September is 18.3°C and therefore is not suitable for comfortable swimming. The warmest sea in Nantes in September is 22.1°C, and the coldest is 15.8°C. Average high air temperature in Nantes in September is 22°C, and average low temperature is 12°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Nantes

Changes water temperature in Nantes in September 2025, 2024

To get an accurate forecast for the water temperature in Nantes for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Nantes, 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	19.9°C	19.7°C	17.3°C	21.3°C
2 September	19.6°C	19.3°C	17.4°C	20.9°C
3 September	19.6°C	19.3°C	17.4°C	21.3°C
4 September	19°C	19.2°C	17.4°C	21.2°C
5 September	19.1°C	19°C	17.3°C	21.2°C
6 September	19.4°C	19°C	17.4°C	21°C
7 September		18.9°C	17.5°C	21.5°C
8 September		18.6°C	17.5°C	21.9°C
9 September		18.3°C	17.4°C	21.8°C
10 September		18.2°C	17.2°C	22.1°C
11 September		18.1°C	17.2°C	21.6°C
12 September		17.5°C	16.9°C	21.8°C
13 September		17.5°C	16.8°C	21.5°C
14 September		17.1°C	16.7°C	21.6°C
15 September		17.1°C	16.6°C	21.4°C

Day	2024	Min	Max
16 September	17.4°C	16.4°C	21.3°C
17 September	17.3°C	16.1°C	21.1°C
18 September	17°C	15.8°C	20.9°C
19 September	17.5°C	15.9°C	20.6°C
20 September	17.9°C	16°C	20.4°C
21 September	17.7°C	16°C	19.9°C
22 September	18°C	16.7°C	19.5°C
23 September	17.9°C	16.8°C	19.2°C
24 September	17.8°C	16.7°C	19.1°C
25 September	17.7°C	16.4°C	19.4°C
26 September	17.7°C	16.5°C	19.4°C
27 September	16.9°C	16.5°C	19.3°C
28 September	16.7°C	16.1°C	18.8°C
29 September	16.5°C	16.1°C	18.9°C
30 September	16.5°C	16°C	19.1°C

Average water temperature in Nantes in September over a decade

2015	2016	2017	2018	2019
17.7°C	18.5°C	17.4°C	18.2°C	18.6°C

2020	2021	2022	2023	2024
19.2°C	19.2°C	19.4°C	20.5°C	17.9°C

Nantes sea state in September

Chart comparing the height of waves in Nantes 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.

Weather and climate in Nantes in September

This data display average monthly climate indicators in Nantes in September based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip

Average HIGH temperature22°C
Average LOW temperature12°C
Average humidity
80
Average rainfall days8 days
Average rainfall2.5''/64mm
Average daylight13h
Average sunshine6.5h
Average UV index5

Nantes 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
Pornic	18.3°C	15.9°C	22.1°C
Tharon-Plage	18.3°C	15.9°C	22.1°C
Plage de la Source	18.3°C	15.9°C	22.1°C
Plage de la Birochere	18.3°C	15.9°C	22.1°C
Les Moutiers En Retz	18.3°C	15.9°C	22°C
Sainte-Marie-sur-Mer	18.2°C	15.9°C	22.1°C
Noeveillard	18.2°C	15.9°C	22.1°C
Plage des Sablons	18.2°C	15.9°C	22.1°C
Plage du Porteau	18.2°C	15.9°C	22.1°C
Plan d'eau Maurice Giros	18.3°C	15.9°C	22°C

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Our report for Nantes 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.

Region

Date (day and month)

Water temperature: min 16°C

Average temperature Maximum temperature