Is it warm enough to swim in Horten in September? Average water temperature in Horten in September is 15.3°C and therefore is not suitable for comfortable swimming. The warmest sea in Horten in September is 18.1°C, and the coldest is 12.3°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Horten
To get an accurate forecast for the water temperature in Horten for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Horten, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of September.
Day | 2025 | 2024 | Min | Max |
---|---|---|---|---|
1 September | 16.3°C | 16.9°C | 16.3°C | 18.1°C |
2 September | 16.8°C | 16.7°C | 16.3°C | 17.7°C |
3 September | 17°C | 16.7°C | 16.2°C | 17.7°C |
4 September | 16.9°C | 16.6°C | 15.8°C | 17.6°C |
5 September | 16.8°C | 17°C | 15.5°C | 17.5°C |
6 September | 16.7°C | 16.6°C | 15.4°C | 17.2°C |
7 September | 17.4°C | 15.3°C | 17.4°C | |
8 September | 16.8°C | 15.2°C | 17.2°C | |
9 September | 17.1°C | 15.1°C | 17.2°C | |
10 September | 17.5°C | 14.9°C | 17.5°C | |
11 September | 16.8°C | 15°C | 16.8°C | |
12 September | 16.3°C | 14.7°C | 17.6°C | |
13 September | 15.6°C | 14.5°C | 17.2°C | |
14 September | 15.1°C | 14.4°C | 17.1°C | |
15 September | 14.9°C | 14.2°C | 17°C |
Day | 2025 | 2024 | Min | Max |
---|---|---|---|---|
16 September | 15.8°C | 14°C | 16.6°C | |
17 September | 15.5°C | 13.8°C | 16.3°C | |
18 September | 14.9°C | 13.5°C | 16.1°C | |
19 September | 15°C | 13.2°C | 16.3°C | |
20 September | 15.5°C | 13°C | 16.2°C | |
21 September | 15.3°C | 13.3°C | 15.9°C | |
22 September | 14.9°C | 13°C | 15.6°C | |
23 September | 14.9°C | 12.9°C | 15.8°C | |
24 September | 14.7°C | 12.9°C | 15.6°C | |
25 September | 15.2°C | 12.9°C | 15.9°C | |
26 September | 14.3°C | 12.8°C | 16°C | |
27 September | 14°C | 12.6°C | 15.8°C | |
28 September | 14.5°C | 12.5°C | 15.7°C | |
29 September | 14.4°C | 12.3°C | 15.5°C | |
30 September | 14.1°C | 12.3°C | 15.1°C |
2015 | 2016 | 2017 | 2018 | 2019 |
14.6°C | 16.3°C | 15.1°C | 16.1°C | 15.4°C |
2020 | 2021 | 2022 | 2023 | 2024 |
15.7°C | 15.5°C | 15.5°C | 16.1°C | 15.7°C |
Chart comparing the height of waves in Horten 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.
You can also view information about water temperature for other months by clicking on the month button below