Water temperature in Rorschach in September
Is it warm enough to swim in Rorschach in September? Average water temperature in Rorschach in September is 19.5°C and therefore is not suitable for comfortable swimming. The warmest water in Rorschach in September is 23.2°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 Rorschach
Changes water temperature in Rorschach in September 2025, 2024
To get an accurate forecast for the water temperature in Rorschach for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Rorschach, 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 | 21.3°C | 23.2°C | 20.3°C | 23.2°C |
2 September | 19.8°C | 22.9°C | 19°C | 22.9°C |
3 September | 19.9°C | 22.9°C | 19.3°C | 22.9°C |
4 September | 19.9°C | 22.9°C | 19.6°C | 22.9°C |
5 September | 19.8°C | 22.7°C | 19.7°C | 22.7°C |
6 September | | 22.3°C | 19.8°C | 22.3°C |
7 September | | 22.4°C | 20°C | 22.4°C |
8 September | | 22.1°C | 19.9°C | 22.1°C |
9 September | | 21.7°C | 19.2°C | 21.7°C |
10 September | | 20.5°C | 19°C | 21.8°C |
11 September | | 20.2°C | 19.4°C | 21.9°C |
12 September | | 19.9°C | 19.1°C | 21.8°C |
13 September | | 19.7°C | 18.8°C | 21.5°C |
14 September | | 19.6°C | 18.7°C | 21.3°C |
15 September | | 19.5°C | 18.7°C | 21°C |
Day |
2025 |
2024 |
Min |
Max |
16 September | | 19.4°C | 18.5°C | 21.3°C |
17 September | | 19.3°C | 18.5°C | 20.9°C |
18 September | | 18.8°C | 18.1°C | 20.5°C |
19 September | | 18.6°C | 18.1°C | 20.8°C |
20 September | | 18.3°C | 18.1°C | 21.3°C |
21 September | | 18.4°C | 17.8°C | 21.3°C |
22 September | | 18.2°C | 17.6°C | 20.9°C |
23 September | | 17.9°C | 17.4°C | 21°C |
24 September | | 17.6°C | 17.2°C | 20.2°C |
25 September | | 17.4°C | 17°C | 19.5°C |
26 September | | 17.1°C | 16.8°C | 18.9°C |
27 September | | 16.9°C | 16.6°C | 18.7°C |
28 September | | 16.8°C | 16.5°C | 18.8°C |
29 September | | 16.7°C | 16.5°C | 18.6°C |
30 September | | 16.6°C | 16.3°C | 18.7°C |
Average water temperature in Rorschach 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 |
20.4°C | 19.3°C | 19°C | 20.2°C | 19.7°C |
Rorschach water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below