Water temperature in Mainau in September
Is it warm enough to swim in Mainau in September? Average water temperature in Mainau in September is 19.6°C and therefore is not suitable for comfortable swimming. The warmest water in Mainau in September is 23.1°C, and the coldest is 16.3°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Mainau
Changes water temperature in Mainau in September 2025, 2024
To get an accurate forecast for the water temperature in Mainau for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Mainau, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of September.
You can choose any other years:
Day |
2025 |
2024 |
Min |
Max |
1 September | 21.5°C | 22.8°C | 20.3°C | 22.8°C |
2 September | 21.1°C | 22.9°C | 20°C | 22.9°C |
3 September | 20.4°C | 23.1°C | 20°C | 23.1°C |
4 September | 20.4°C | 22.8°C | 19.7°C | 22.8°C |
5 September | 20.2°C | 22.6°C | 19.9°C | 22.6°C |
6 September | | 22.4°C | 19.9°C | 22.4°C |
7 September | | 22.7°C | 19.8°C | 22.7°C |
8 September | | 22.3°C | 20°C | 22.3°C |
9 September | | 21.9°C | 19.2°C | 21.9°C |
10 September | | 21.2°C | 19.1°C | 21.8°C |
11 September | | 20.8°C | 19.4°C | 22.6°C |
12 September | | 20.5°C | 19.2°C | 23.1°C |
13 September | | 20.2°C | 18.9°C | 22.6°C |
14 September | | 20°C | 18.8°C | 22.3°C |
15 September | | 19.9°C | 18.8°C | 21.3°C |
Day |
2025 |
2024 |
Min |
Max |
16 September | | 19.8°C | 18.5°C | 21.4°C |
17 September | | 19.6°C | 18.5°C | 21°C |
18 September | | 19.4°C | 18.1°C | 20.7°C |
19 September | | 19°C | 18.1°C | 20.8°C |
20 September | | 18.7°C | 18.1°C | 21°C |
21 September | | 18.2°C | 17.9°C | 21.1°C |
22 September | | 18°C | 17.7°C | 20.6°C |
23 September | | 17.8°C | 17.5°C | 20.8°C |
24 September | | 17.5°C | 17.2°C | 20.1°C |
25 September | | 17.3°C | 17°C | 19.5°C |
26 September | | 17.1°C | 16.9°C | 19°C |
27 September | | 16.8°C | 16.7°C | 18.6°C |
28 September | | 16.7°C | 16.7°C | 19°C |
29 September | | 16.7°C | 16.5°C | 18.8°C |
30 September | | 16.6°C | 16.3°C | 18.9°C |
Average water temperature in Mainau in September over a decade
2015 | 2016 | 2017 | 2018 | 2019 |
19.2°C | 20.3°C | 19.1°C | 20.5°C | 19.3°C |
2020 | 2021 | 2022 | 2023 | 2024 |
20.5°C | 19.4°C | 19.4°C | 20.6°C | 19.8°C |
Mainau water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below