Is it warm enough to swim in Annecy in September? Average water temperature in Annecy in September is 17.6°C and therefore is not suitable for comfortable swimming. The warmest water in Annecy in September is 23°C, and the coldest is 11°C. Average high air temperature in Annecy in September is 21°C, and average low temperature is 10°C. To find out the water temperature today and in the coming days, go to Current water temperature in Annecy
To get an accurate forecast for the water temperature in Annecy for any chosen month, compare two years within a 10 year range using the chart below.
Day | 2025 | 2024 |
---|---|---|
1 September | 18°C | 23°C |
2 September | 18°C | 22°C |
3 September | 18°C | 21°C |
4 September | 18°C | 20°C |
5 September | 18°C | 20°C |
6 September | 18°C | 19°C |
7 September | 18°C | |
8 September | 17°C | |
9 September | 16°C | |
10 September | 15°C | |
11 September | 14°C | |
12 September | 12°C | |
13 September | 12°C | |
14 September | 11°C | |
15 September | 11°C |
Day | 2025 | 2024 |
---|---|---|
16 September | 11°C | |
17 September | 12°C | |
18 September | 13°C | |
19 September | 14°C | |
20 September | 14°C | |
21 September | 14°C | |
22 September | 14°C | |
23 September | 15°C | |
24 September | 15°C | |
25 September | 14°C | |
26 September | 14°C | |
27 September | 13°C | |
28 September | 13°C | |
29 September | 13°C | |
30 September | 13°C |
2015 | 2016 | 2017 | 2018 | 2019 |
16.2°C | 19.3°C | 15.2°C | 18.9°C | 18.4°C |
2020 | 2021 | 2022 | 2023 | 2024 |
18.2°C | 18°C | 16.9°C | 19.4°C | 15.1°C |
This data display average monthly climate indicators in Annecy 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
You can also view information about water temperature for other months by clicking on the month button below